what about an evolving tangible, like on a rubikcube, so you can shuffle and change ...

or coverring the table with sand , or something like that, maybe less dirty. Or something you can draw on to make tangibles out of nothing ... mixing the reactable with the sandtable idea : bofunk.com/video/2657/sand_drawing.html

lot s of idea flow to my mind, i have to write them down and send you. Keep up the good work !