diff --git a/src/App.tsx b/src/App.tsx
index 1d7bcaf5f..cbd75e0ac 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -22,19 +22,20 @@ import { AxisIndicator } from './components/AxisIndicator'
 import { RenderViewerArtifacts } from './components/RenderViewerArtifacts'
 import { PanelHeader } from './components/PanelHeader'
 import { MemoryPanel } from './components/MemoryPanel'
+import { useHotKeyListener } from './hooks/useHotKeyListener'
 
 const OrrthographicCamera = OrthographicCamera as any
 
 function App() {
   const cam = useRef()
+  useHotKeyListener()
   const {
     editorView,
     setEditorView,
-    setSelectionRange,
-    selectionRange,
+    setSelectionRanges,
+    selectionRanges: selectionRange,
     guiMode,
     lastGuiMode,
-    removeError,
     addLog,
     code,
     setCode,
@@ -48,11 +49,10 @@ function App() {
   } = useStore((s) => ({
     editorView: s.editorView,
     setEditorView: s.setEditorView,
-    setSelectionRange: s.setSelectionRange,
-    selectionRange: s.selectionRange,
+    setSelectionRanges: s.setSelectionRanges,
+    selectionRanges: s.selectionRanges,
     guiMode: s.guiMode,
     setGuiMode: s.setGuiMode,
-    removeError: s.removeError,
     addLog: s.addLog,
     code: s.code,
     setCode: s.setCode,
@@ -76,13 +76,16 @@ function App() {
     if (!editorView) {
       setEditorView(viewUpdate.view)
     }
-    const range = viewUpdate.state.selection.ranges[0]
-    // console.log(viewUpdate.state.selection.ranges)
-    // TODO allow multiple cursors so that we can do constrain style features
-    const isNoChange =
-      range.from === selectionRange[0] && range.to === selectionRange[1]
-    if (isNoChange) return
-    setSelectionRange([range.from, range.to])
+    const ranges = viewUpdate.state.selection.ranges
+
+    const isChange =
+      ranges.length !== selectionRange.length ||
+      ranges.some(({ from, to }, i) => {
+        return from !== selectionRange[i][0] || to !== selectionRange[i][1]
+      })
+
+    if (!isChange) return
+    setSelectionRanges(ranges.map(({ from, to }) => [from, to]))
   }
   const [geoArray, setGeoArray] = useState<(ExtrudeGroup | SketchGroup)[]>([])
   useEffect(() => {
@@ -90,7 +93,6 @@ function App() {
       if (!code) {
         setGeoArray([])
         setAst(null)
-        removeError()
         return
       }
       const tokens = lexer(code)
@@ -129,7 +131,6 @@ function App() {
         .filter((a) => a) as (ExtrudeGroup | SketchGroup)[]
 
       setGeoArray(geos)
-      removeError()
       console.log(programMemory)
       setError()
     } catch (e: any) {
@@ -138,15 +139,15 @@ function App() {
       addLog(e)
     }
   }, [code])
-  const shouldFormat = useMemo(() => {
-    if (!ast) return false
-    const recastedCode = recast(ast)
-    return recastedCode !== code
-  }, [code, ast])
+  // const shouldFormat = useMemo(() => {
+  //   if (!ast) return false
+  //   const recastedCode = recast(ast)
+  //   return recastedCode !== code
+  // }, [code, ast])
   return (
     <div className="h-screen">
       <Allotment snap={true}>
-        <Allotment vertical defaultSizes={[4, 1, 1]}>
+        <Allotment vertical defaultSizes={[4, 1, 1]} minSize={20}>
           <div className="h-full flex flex-col items-start">
             <PanelHeader title="Editor" />
             {/* <button
diff --git a/src/Toolbar.tsx b/src/Toolbar.tsx
index 25db13537..48e03439b 100644
--- a/src/Toolbar.tsx
+++ b/src/Toolbar.tsx
@@ -3,15 +3,21 @@ import { extrudeSketch, sketchOnExtrudedFace } from './lang/modifyAst'
 import { getNodePathFromSourceRange } from './lang/abstractSyntaxTree'
 
 export const Toolbar = () => {
-  const { setGuiMode, guiMode, selectionRange, ast, updateAst, programMemory } =
-    useStore((s) => ({
-      guiMode: s.guiMode,
-      setGuiMode: s.setGuiMode,
-      selectionRange: s.selectionRange,
-      ast: s.ast,
-      updateAst: s.updateAst,
-      programMemory: s.programMemory,
-    }))
+  const {
+    setGuiMode,
+    guiMode,
+    selectionRanges,
+    ast,
+    updateAst,
+    programMemory,
+  } = useStore((s) => ({
+    guiMode: s.guiMode,
+    setGuiMode: s.setGuiMode,
+    selectionRanges: s.selectionRanges,
+    ast: s.ast,
+    updateAst: s.updateAst,
+    programMemory: s.programMemory,
+  }))
 
   return (
     <div>
@@ -32,7 +38,10 @@ export const Toolbar = () => {
         <button
           onClick={() => {
             if (!ast) return
-            const pathToNode = getNodePathFromSourceRange(ast, selectionRange)
+            const pathToNode = getNodePathFromSourceRange(
+              ast,
+              selectionRanges[0]
+            )
             const { modifiedAst } = sketchOnExtrudedFace(
               ast,
               pathToNode,
@@ -54,7 +63,6 @@ export const Toolbar = () => {
               pathToNode: guiMode.pathToNode,
               rotation: guiMode.rotation,
               position: guiMode.position,
-              isTooltip: true,
             })
           }}
           className="border m-1 px-1 rounded"
@@ -67,7 +75,10 @@ export const Toolbar = () => {
           <button
             onClick={() => {
               if (!ast) return
-              const pathToNode = getNodePathFromSourceRange(ast, selectionRange)
+              const pathToNode = getNodePathFromSourceRange(
+                ast,
+                selectionRanges[0]
+              )
               const { modifiedAst, pathToExtrudeArg } = extrudeSketch(
                 ast,
                 pathToNode
@@ -81,7 +92,10 @@ export const Toolbar = () => {
           <button
             onClick={() => {
               if (!ast) return
-              const pathToNode = getNodePathFromSourceRange(ast, selectionRange)
+              const pathToNode = getNodePathFromSourceRange(
+                ast,
+                selectionRanges[0]
+              )
               const { modifiedAst, pathToExtrudeArg } = extrudeSketch(
                 ast,
                 pathToNode,
@@ -105,7 +119,11 @@ export const Toolbar = () => {
         </button>
       )}
       {toolTips.map((sketchFnName) => {
-        if (guiMode.mode !== 'sketch' || !('isTooltip' in guiMode)) return null
+        if (
+          guiMode.mode !== 'sketch' ||
+          !('isTooltip' in guiMode || guiMode.sketchMode === 'sketchEdit')
+        )
+          return null
         return (
           <button
             key={sketchFnName}
@@ -115,10 +133,14 @@ export const Toolbar = () => {
             onClick={() =>
               setGuiMode({
                 ...guiMode,
-                sketchMode:
-                  guiMode.sketchMode === sketchFnName
-                    ? 'sketchEdit'
-                    : sketchFnName,
+                ...(guiMode.sketchMode === sketchFnName
+                  ? {
+                      sketchMode: 'sketchEdit',
+                    }
+                  : {
+                      sketchMode: sketchFnName,
+                      isTooltip: true,
+                    }),
               })
             }
           >
diff --git a/src/components/BasePlanes.tsx b/src/components/BasePlanes.tsx
index f305114ef..b659ac5b0 100644
--- a/src/components/BasePlanes.tsx
+++ b/src/components/BasePlanes.tsx
@@ -69,7 +69,6 @@ export const BasePlanes = () => {
       rotation: quaternion.toArray() as [number, number, number, number],
       position: [0, 0, 0],
       pathToNode,
-      isTooltip: true,
     })
 
     updateAst(modifiedAst)
diff --git a/src/components/PanelHeader.tsx b/src/components/PanelHeader.tsx
index 7ac1c1b8c..951093fd4 100644
--- a/src/components/PanelHeader.tsx
+++ b/src/components/PanelHeader.tsx
@@ -1,7 +1,7 @@
 export const PanelHeader = ({ title }: { title: string }) => {
   return (
-    <div className="font-mono text-xs bg-stone-100 w-full pl-4 h-[30px] text-stone-700 flex items-center">
-      {title}
+    <div className="font-mono text-[11px] bg-stone-100 w-full pl-4 h-[20px] text-stone-700 flex items-center">
+      <span className="pt-1">{title}</span>
     </div>
   )
 }
diff --git a/src/components/RenderViewerArtifacts.tsx b/src/components/RenderViewerArtifacts.tsx
index d1dcb7f06..07fe8ed76 100644
--- a/src/components/RenderViewerArtifacts.tsx
+++ b/src/components/RenderViewerArtifacts.tsx
@@ -88,7 +88,9 @@ function MovingSphere({
           inverseQuaternion.set(...guiMode.rotation)
           inverseQuaternion.invert()
         }
-        current2d.sub(new Vector3(...position).applyQuaternion(inverseQuaternion))
+        current2d.sub(
+          new Vector3(...position).applyQuaternion(inverseQuaternion)
+        )
         let [x, y] = [roundOff(current2d.x, 2), roundOff(current2d.y, 2)]
         let theNewPoints: [number, number] = [x, y]
         const { modifiedAst } = changeSketchArguments(
@@ -284,10 +286,10 @@ function WallRender({
   rotation: Rotation
   position: Position
 }) {
-  const { setHighlightRange, selectionRange } = useStore(
-    ({ setHighlightRange, selectionRange }) => ({
+  const { setHighlightRange, selectionRanges } = useStore(
+    ({ setHighlightRange, selectionRanges }) => ({
       setHighlightRange,
-      selectionRange,
+      selectionRanges,
     })
   )
   const onClick = useSetCursor(geoInfo.__geoMeta.sourceRange)
@@ -297,12 +299,11 @@ function WallRender({
 
   const [editorCursor, setEditorCursor] = useState(false)
   useEffect(() => {
-    const shouldHighlight = isOverlap(
-      geoInfo.__geoMeta.sourceRange,
-      selectionRange
+    const shouldHighlight = selectionRanges.some((range) =>
+      isOverlap(geoInfo.__geoMeta.sourceRange, range)
     )
     setEditorCursor(shouldHighlight)
-  }, [selectionRange, geoInfo])
+  }, [selectionRanges, geoInfo])
 
   return (
     <>
@@ -347,17 +348,16 @@ function PathRender({
   rotation: Rotation
   position: Position
 }) {
-  const { selectionRange } = useStore(({ selectionRange }) => ({
-    selectionRange,
+  const { selectionRanges } = useStore(({ selectionRanges }) => ({
+    selectionRanges,
   }))
   const [editorCursor, setEditorCursor] = useState(false)
   useEffect(() => {
-    const shouldHighlight = isOverlap(
-      geoInfo.__geoMeta.sourceRange,
-      selectionRange
+    const shouldHighlight = selectionRanges.some((range) =>
+      isOverlap(geoInfo.__geoMeta.sourceRange, range)
     )
     setEditorCursor(shouldHighlight)
-  }, [selectionRange, geoInfo])
+  }, [selectionRanges, geoInfo])
   return (
     <>
       {geoInfo.__geoMeta.geos.map((meta, i) => {
@@ -404,8 +404,8 @@ function LineRender({
   rotation: Rotation
   position: Position
 }) {
-  const { setHighlightRange } = useStore(({ setHighlightRange }) => ({
-    setHighlightRange,
+  const { setHighlightRange } = useStore((s) => ({
+    setHighlightRange: s.setHighlightRange,
   }))
   const onClick = useSetCursor(sourceRange)
   // This reference will give us direct access to the mesh
@@ -440,9 +440,9 @@ function LineRender({
 type Artifact = ExtrudeGroup | SketchGroup
 
 function useSetAppModeFromCursorLocation(artifacts: Artifact[]) {
-  const { selectionRange, guiMode, setGuiMode, ast } = useStore(
-    ({ selectionRange, guiMode, setGuiMode, ast }) => ({
-      selectionRange,
+  const { selectionRanges, guiMode, setGuiMode, ast } = useStore(
+    ({ selectionRanges, guiMode, setGuiMode, ast }) => ({
+      selectionRanges,
       guiMode,
       setGuiMode,
       ast,
@@ -469,7 +469,7 @@ function useSetAppModeFromCursorLocation(artifacts: Artifact[]) {
     )[] = []
     artifacts?.forEach((artifact) => {
       artifact.value.forEach((geo) => {
-        if (isOverlap(geo.__geoMeta.sourceRange, selectionRange)) {
+        if (isOverlap(geo.__geoMeta.sourceRange, selectionRanges[0])) {
           artifactsWithinCursorRange.push({
             parentType: artifact.type,
             isParent: false,
@@ -481,7 +481,7 @@ function useSetAppModeFromCursorLocation(artifacts: Artifact[]) {
         }
       })
       artifact.__meta.forEach((meta) => {
-        if (isOverlap(meta.sourceRange, selectionRange)) {
+        if (isOverlap(meta.sourceRange, selectionRanges[0])) {
           artifactsWithinCursorRange.push({
             parentType: artifact.type,
             isParent: true,
@@ -530,5 +530,5 @@ function useSetAppModeFromCursorLocation(artifacts: Artifact[]) {
     ) {
       setGuiMode({ mode: 'default' })
     }
-  }, [artifacts, selectionRange])
+  }, [artifacts, selectionRanges])
 }
diff --git a/src/components/SketchPlane.tsx b/src/components/SketchPlane.tsx
index b434b674c..a521a05ff 100644
--- a/src/components/SketchPlane.tsx
+++ b/src/components/SketchPlane.tsx
@@ -14,7 +14,7 @@ export const SketchPlane = () => {
   if (guiMode.mode !== 'sketch') {
     return null
   }
-  if (!(guiMode.sketchMode === 'lineTo') && !('isTooltip' in guiMode)) {
+  if (!(guiMode.sketchMode === 'sketchEdit') && !('isTooltip' in guiMode)) {
     return null
   }
 
diff --git a/src/hooks/useHotKeyListener.ts b/src/hooks/useHotKeyListener.ts
new file mode 100644
index 000000000..316ce1f5e
--- /dev/null
+++ b/src/hooks/useHotKeyListener.ts
@@ -0,0 +1,21 @@
+import { useStore } from '../useStore'
+import { useEffect } from 'react'
+
+export function useHotKeyListener() {
+  const { setIsShiftDown } = useStore((s) => ({
+    setIsShiftDown: s.setIsShiftDown,
+  }))
+  const keyName = 'CapsLock' // TODO #32 should be shift, but shift conflicts with the editor's use of the shift key atm.
+  useEffect(() => {
+    const handleKeyDown = (event: KeyboardEvent) =>
+      event.key === keyName && setIsShiftDown(true)
+    const handleKeyUp = (event: KeyboardEvent) =>
+      event.key === keyName && setIsShiftDown(false)
+    window.addEventListener('keydown', handleKeyDown)
+    window.addEventListener('keyup', handleKeyUp)
+    return () => {
+      window.removeEventListener('keydown', handleKeyDown)
+      window.removeEventListener('keyup', handleKeyUp)
+    }
+  }, [setIsShiftDown])
+}
diff --git a/src/hooks/useSetCursor.ts b/src/hooks/useSetCursor.ts
index 2a7008d26..002eabd5b 100644
--- a/src/hooks/useSetCursor.ts
+++ b/src/hooks/useSetCursor.ts
@@ -1,9 +1,17 @@
-import { useStore } from '../useStore'
+import { useStore, Range } from '../useStore'
 
-export function useSetCursor(sourceRange: [number, number]) {
-  const setCursor = useStore((state) => state.setCursor)
+export function useSetCursor(sourceRange: Range) {
+  const { setCursor, selectionRanges, isShiftDown } = useStore((s) => ({
+    setCursor: s.setCursor,
+    selectionRanges: s.selectionRanges,
+    isShiftDown: s.isShiftDown,
+  }))
   return () => {
-    setCursor(sourceRange[1])
+    console.log('isShiftDown', isShiftDown, selectionRanges, sourceRange)
+    const ranges = isShiftDown
+      ? [...selectionRanges, sourceRange]
+      : [sourceRange]
+    setCursor(ranges)
     const element: HTMLDivElement | null = document.querySelector('.cm-content')
     if (element) {
       element.focus()
diff --git a/src/lang/artifact.test.ts b/src/lang/artifact.test.ts
index d733c40da..199e67e01 100644
--- a/src/lang/artifact.test.ts
+++ b/src/lang/artifact.test.ts
@@ -190,7 +190,7 @@ show(theExtrude, sk2)`
           0.9230002039112792,
         ],
         __meta: [
-          { sourceRange: [190, 218], pathToNode: [] },
+          { sourceRange: [203, 218], pathToNode: [] },
           { sourceRange: [13, 34], pathToNode: [] },
         ],
       },
diff --git a/src/lang/executor.ts b/src/lang/executor.ts
index aae0cd89a..25029ac7f 100644
--- a/src/lang/executor.ts
+++ b/src/lang/executor.ts
@@ -258,53 +258,19 @@ export const executor = (
             __meta,
           }
         } else if (declaration.init.type === 'CallExpression') {
-          const functionName = declaration.init.callee.name
-          const fnArgs = declaration.init.arguments.map((arg) => {
-            if (arg.type === 'Literal') {
-              return arg.value
-            } else if (arg.type === 'Identifier') {
-              return _programMemory.root[arg.name].value
-            } else if (arg.type === 'ObjectExpression') {
-              return executeObjectExpression(_programMemory, arg)
-            } else if (arg.type === 'ArrayExpression') {
-              return executeArrayExpression(_programMemory, arg)
-            }
-            throw new Error(
-              `Unexpected argument type ${arg.type} in function call`
-            )
-          })
-          if (functionName in internalFns) {
-            const result = executeCallExpression(
-              _programMemory,
-              declaration.init,
-              previousPathToNode,
-              {
-                sourceRangeOverride: [declaration.start, declaration.end],
-                isInPipe: false,
-                previousResults: [],
-                expressionIndex: 0,
-                body: [],
-              }
-            )
-            if (
-              result.type === 'extrudeGroup' ||
-              result.type === 'sketchGroup'
-            ) {
-              _programMemory.root[variableName] = result
-            } else {
-              _programMemory.root[variableName] = {
-                type: 'userVal',
-                value: result,
-                __meta,
-              }
-            }
-          } else {
-            _programMemory.root[variableName] = {
-              type: 'userVal',
-              value: _programMemory.root[functionName].value(...fnArgs),
-              __meta,
-            }
-          }
+          const result = executeCallExpression(
+            _programMemory,
+            declaration.init,
+            previousPathToNode
+          )
+          _programMemory.root[variableName] =
+            result?.type === 'sketchGroup' || result?.type === 'extrudeGroup'
+              ? result
+              : {
+                  type: 'userVal',
+                  value: result,
+                  __meta,
+                }
         } else {
           throw new Error(
             'Unsupported declaration type: ' + declaration.init.type
diff --git a/src/lang/std/sketch.test.ts b/src/lang/std/sketch.test.ts
index 03ab90fe8..c5a6d0de5 100644
--- a/src/lang/std/sketch.test.ts
+++ b/src/lang/std/sketch.test.ts
@@ -118,7 +118,6 @@ show(mySketch001)`
       {
         mode: 'sketch',
         sketchMode: 'sketchEdit',
-        isTooltip: true,
         rotation: [0, 0, 0, 1],
         position: [0, 0, 0],
         pathToNode: ['body', 0, 'declarations', '0', 'init'],
diff --git a/src/useStore.ts b/src/useStore.ts
index 2d64b8f0d..08fc5ec24 100644
--- a/src/useStore.ts
+++ b/src/useStore.ts
@@ -8,8 +8,10 @@ import {
 import { ProgramMemory, Position, PathToNode, Rotation } from './lang/executor'
 import { recast } from './lang/recast'
 import { asyncLexer } from './lang/tokeniser'
+import { EditorSelection } from '@codemirror/state'
 
 export type Range = [number, number]
+export type Ranges = Range[]
 export type TooTip =
   | 'lineTo'
   | 'line'
@@ -53,7 +55,6 @@ export type GuiModes =
   | {
       mode: 'sketch'
       sketchMode: 'sketchEdit'
-      isTooltip: true
       rotation: Rotation
       position: Position
       pathToNode: PathToNode
@@ -80,13 +81,12 @@ interface StoreState {
   setEditorView: (editorView: EditorView) => void
   highlightRange: [number, number]
   setHighlightRange: (range: Range) => void
-  setCursor: (start: number, end?: number) => void
-  selectionRange: [number, number]
-  setSelectionRange: (range: Range) => void
+  setCursor: (selections: Ranges) => void
+  selectionRanges: Ranges
+  setSelectionRanges: (range: Ranges) => void
   guiMode: GuiModes
   lastGuiMode: GuiModes
   setGuiMode: (guiMode: GuiModes) => void
-  removeError: () => void
   logs: string[]
   addLog: (log: string) => void
   resetLogs: () => void
@@ -103,6 +103,8 @@ interface StoreState {
   setError: (error?: string) => void
   programMemory: ProgramMemory
   setProgramMemory: (programMemory: ProgramMemory) => void
+  isShiftDown: boolean
+  setIsShiftDown: (isShiftDown: boolean) => void
 }
 
 export const useStore = create<StoreState>()((set, get) => ({
@@ -118,27 +120,25 @@ export const useStore = create<StoreState>()((set, get) => ({
       editorView.dispatch({ effects: addLineHighlight.of(highlightRange) })
     }
   },
-  setCursor: (start: number, end: number = start) => {
-    const editorView = get().editorView
+  setCursor: (ranges: Ranges) => {
+    const { editorView } = get()
     if (!editorView) return
     editorView.dispatch({
-      selection: { anchor: start, head: end },
+      selection: EditorSelection.create(
+        [...ranges.map(([start, end]) => EditorSelection.cursor(end))],
+        ranges.length - 1
+      ),
     })
   },
-  selectionRange: [0, 0],
-  setSelectionRange: (selectionRange) => {
-    set({ selectionRange })
+  selectionRanges: [[0, 0]],
+  setSelectionRanges: (selectionRanges) => {
+    set({ selectionRanges })
   },
   guiMode: { mode: 'default' },
   lastGuiMode: { mode: 'default' },
   setGuiMode: (guiMode) => {
-    const lastGuiMode = get().guiMode
     set({ guiMode })
   },
-  removeError: () => {
-    const lastGuiMode = get().lastGuiMode
-    const currentGuiMode = get().guiMode
-  },
   logs: [],
   addLog: (log) => {
     if (Array.isArray(log)) {
@@ -165,7 +165,7 @@ export const useStore = create<StoreState>()((set, get) => ({
       const { start, end } = node
       if (!start || !end) return
       setTimeout(() => {
-        get().setCursor(start, end)
+        get().setCursor([[start, end]])
       })
     }
   },
@@ -188,4 +188,6 @@ export const useStore = create<StoreState>()((set, get) => ({
   },
   programMemory: { root: {}, _sketch: [] },
   setProgramMemory: (programMemory) => set({ programMemory }),
+  isShiftDown: false,
+  setIsShiftDown: (isShiftDown) => set({ isShiftDown }),
 }))