Check out SceneViewerQuad.py which creates four scene.Scenes embedded in one ui.View. Touch the four quadrants of the screen to create colored circles. By properly placing four fingers on the screen, you can even get four different colored circles at the same time.

I want to drag a circle across multiple scenes and have it change colors based on the underlying scene. Unfortunately, touch events are only triggered in the scene that they start in. How can I drag a circle from one scene to another?