NOVA is a 3D led screen, developed by ETH Zurich.

It  has many possible application fields, and

is used for academic research in the area of human computer interaction for the development of 2D and 3D interfaces involving visual and haptic inputs and outputs.

Read more about the project at http://novalabs.ch/
and at http://www.nova.ethz.ch/index.php

This demonstration of Baby Nova at the Shangai International Science & Art Exhibition 2009, shows acoustic audio being mapped onto  3D space.