I discussed with David that it would be awesome to use some patches of OLED, or LEDs and PDLC panels to build together a volumetric display, that consists of cubic transparent, switchable voxels.
I was fascinated by the idea and had some spare time left, so I decided to create a small simulated playground environment with Processing. You can find the sources at GitHub. It simulates a cubic volumetric display with 4096 voxels. This is how it looks, I think it would be pretty cool to have one of these: