diff --git a/dotscape b/dotscape
new file mode 100755
index 0000000..f2be6a8
Binary files /dev/null and b/dotscape differ
diff --git a/ffi/export.h b/ffi/export.h
index c1080ad..5864c66 100644
--- a/ffi/export.h
+++ b/ffi/export.h
@@ -157,6 +157,10 @@ typedef Pointer Objptr;
 extern "C" {
 #endif
 
+MLLIB_PUBLIC(void mltonMouseMoveCallback (Real32 x0, Real32 x1);)
+MLLIB_PUBLIC(void mltonMouseClickCallback (Int32 x0, Int32 x1);)
+MLLIB_PUBLIC(void mltonFramebufferSizeCallback (Int32 x0, Int32 x1);)
+MLLIB_PUBLIC(void mltonKeyCallback (Int32 x0, Int32 x1, Int32 x2, Int32 x3);)
 
 #undef MLLIB_PRIVATE
 #undef MLLIB_PUBLIC
diff --git a/imperative-shell/app-draw.sml b/imperative-shell/app-draw.sml
index 888cbb1..7919d7f 100644
--- a/imperative-shell/app-draw.sml
+++ b/imperative-shell/app-draw.sml
@@ -111,7 +111,7 @@ struct
   val uploadModalText = uploadDotVector
   val drawModalText = drawDot
 
-  val initTriangles = initDot
-  val uploadTrianglesVector = uploadDotVector
-  val drawTriangles = drawDot
+  val initSquares = initDot
+  val uploadSquaresVector = uploadDotVector
+  val drawSquares = drawDot
 end
diff --git a/imperative-shell/draw-thread.sml b/imperative-shell/draw-thread.sml
index abb6c8c..7a1416a 100644
--- a/imperative-shell/draw-thread.sml
+++ b/imperative-shell/draw-thread.sml
@@ -10,8 +10,8 @@ struct
     , drawGraphLength
     , dotDrawObject
     , dotDrawLength
-    , triangleDrawObject
-    , triangleDrawLength
+    , squareDrawObject
+    , squareDrawLength
     , modalTextDrawObject
     , modalTextDrawLength
     ) =
@@ -23,8 +23,7 @@ struct
             val _ = Gles3.clear ()
 
             val _ = AppDraw.drawGraphLines (graphDrawObject, drawGraphLength)
-            val _ =
-              AppDraw.drawTriangles (triangleDrawObject, triangleDrawLength)
+            val _ = AppDraw.drawSquares (squareDrawObject, squareDrawLength)
             val _ = AppDraw.drawDot (dotDrawObject, dotDrawLength)
             val _ =
               AppDraw.drawModalText (modalTextDrawObject, modalTextDrawLength)
@@ -39,8 +38,8 @@ struct
               , drawGraphLength
               , dotDrawObject
               , dotDrawLength
-              , triangleDrawObject
-              , triangleDrawLength
+              , squareDrawObject
+              , squareDrawLength
               , modalTextDrawObject
               , modalTextDrawLength
               )
@@ -59,18 +58,17 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , dotDrawLength
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
                end
-           | DRAW_TRIANGLES_AND_RESET_DOTS triangleVec =>
+           | DRAW_SQUARES_AND_RESET_DOTS squareVec =>
                let
                  val _ =
-                   AppDraw.uploadTrianglesVector
-                     (triangleDrawObject, triangleVec)
-                 val triangleDrawLength = Vector.length triangleVec div 5
+                   AppDraw.uploadSquaresVector (squareDrawObject, squareVec)
+                 val squareDrawLength = Vector.length squareVec div 5
                (* dots are reset by setting dotDrawLength to 0 *)
                in
                  run
@@ -80,18 +78,17 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , 0
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
                end
-           | DRAW_TRIANGLES_AND_DOTS {triangles = triangleVec, dots = dotsVec} =>
+           | DRAW_SQUARES_AND_DOTS {squares = squareVec, dots = dotsVec} =>
                let
                  val _ =
-                   AppDraw.uploadTrianglesVector
-                     (triangleDrawObject, triangleVec)
-                 val triangleDrawLength = Vector.length triangleVec div 5
+                   AppDraw.uploadSquaresVector (squareDrawObject, squareVec)
+                 val squareDrawLength = Vector.length squareVec div 5
 
                  val _ = AppDraw.uploadDotVector (dotDrawObject, dotsVec)
                  val dotDrawLength = Vector.length dotsVec div 5
@@ -103,8 +100,8 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , dotDrawLength
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
@@ -120,17 +117,16 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , dotDrawLength
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
                end
-           | RESIZE_TRIANGLES_DOTS_AND_GRAPH {triangles, graphLines, dots} =>
+           | RESIZE_SQUARES_DOTS_AND_GRAPH {squares, graphLines, dots} =>
                let
-                 val _ =
-                   AppDraw.uploadTrianglesVector (triangleDrawObject, triangles)
-                 val triangleDrawLength = Vector.length triangles div 5
+                 val _ = AppDraw.uploadSquaresVector (squareDrawObject, squares)
+                 val squareDrawLength = Vector.length squares div 5
 
                  val _ = AppDraw.uploadGraphLines (graphDrawObject, graphLines)
                  val drawGraphLength = Vector.length graphLines div 2
@@ -145,8 +141,8 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , dotDrawLength
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
@@ -163,8 +159,8 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , dotDrawLength
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
@@ -181,8 +177,8 @@ struct
                    , drawGraphLength
                    , dotDrawObject
                    , dotDrawLength
-                   , triangleDrawObject
-                   , triangleDrawLength
+                   , squareDrawObject
+                   , squareDrawLength
                    , modalTextDrawObject
                    , modalTextDrawLength
                    )
diff --git a/imperative-shell/shell.sml b/imperative-shell/shell.sml
index a896614..eafa393 100644
--- a/imperative-shell/shell.sml
+++ b/imperative-shell/shell.sml
@@ -27,7 +27,7 @@ struct
       val _ = AppDraw.uploadGraphLines (graphDrawObject, graphLines)
 
       val dotDrawObject = AppDraw.initDot ()
-      val triangleDrawObject = AppDraw.initTriangles ()
+      val squareDrawObject = AppDraw.initSquares ()
 
       val modalTextDrawObject = AppDraw.initModalText ()
 
@@ -48,7 +48,7 @@ struct
           , Vector.length graphLines div 2
           , dotDrawObject
           , 0
-          , triangleDrawObject
+          , squareDrawObject
           , 0
           , modalTextDrawObject
           , 0