Deskarama is basically a “low-cost interactive space browser for three dimensional architectural designs” that “deploys a high-resolution position sensor to find the position of a lightweight LCD panel placed on a plan drawing of a building.” Video after the jump.
It uses radiosity-based photorealistic visualization technology to interactively display on the LCD panel a three-dimensional interior view of the building model as if it were placed on the plan and sectioned at the position where the LCD panel touches the drawing