diff --git a/shaping/sphere_callbacks.lua b/shaping/sphere_callbacks.lua
new file mode 100644
index 0000000..649553e
--- /dev/null
+++ b/shaping/sphere_callbacks.lua
@@ -0,0 +1,19 @@
+-- The sphere scale has a default value of 1.0 that can be overridden
+local sphere_scale = sphere_scale or 1.0
+
+dimensions = 3
+
+shapes = {
+  {
+    name = "sphere",
+    material = "steel",
+    geometry = {
+      format = "stl",
+      path = "../quest/sphere.stl",
+      units = "cm",
+      operators = {
+        { scale = function() return {sphere_scale} end }
+      }
+    }
+  }
+}
diff --git a/shaping/sphere_initialization.lua b/shaping/sphere_initialization.lua
new file mode 100644
index 0000000..e5a2587
--- /dev/null
+++ b/shaping/sphere_initialization.lua
@@ -0,0 +1,3 @@
+return {
+  sphere_scale = 0.8
+}