My friend Nick and I came up with an idea for making a tool for ecosystem education. Similar to other hierarchical systems, ecosystems also tend to have a distinct "layered" distribution of flora and fauna (e.g. the type of creatures one would encounter in an ocean at different levels of depth varies greatly). To that end, we designed and  built a tangible ecosystem browser called Waferlens.

left: hardware system included a Kinect for depth sensing, a Surface touchscreen, a pico-projector to project onto the sheet of paper etc.; middle & right: exploring oceans and forest ecosystems by moving a thick sheet of paper on top of the Surface (like a window-into-the-world of a particular ecosystem).

Using connected components on a Kinect depth stream to track a sheet of thick paper, we augmented it with depth arranged content (using an overhead projector) that included images and descriptions of the various organisms making up an ecosystem.

Here's a video demo of this system in action:

we presented WaferLens in a graduate-level seminar class (MTS 525)