This is really cool – a new slant on augmented reality. Take a sandpit, focus a number of cameras on it, project a load of light sources on it and add a significant amount of computer modelling and processing (I would imagine) and you can mix the real and digital in a really neat new way.
As you mould the sand the computer recreates the contours in the virtual space too. Then things moving in the virtual space move according to the contours in the real space – and are then projected back onto it.
For full details of the project, see http://mimicry.monobanda.nl/
I particularly like the bit where they put a hand in the sand. Its like a 3D computer version of pin-art …
This could be a really interesting way to get people modelling terrain in virtual worlds or games.