Here's a preview of the ultraORB by James N. Sears and his father Ron Sears. It's a dual-axis rotating display creates color visualizations of models in 3D space, using persistence of vision.

A rotating 320 tri-color LEDs about two axes simultaneously under the control of sixteen microcontrollers, creates a fully volumetric display that can display arbitrary models within the three dimensional volume of an 11" sphere.

It will be at the ITP Spring Show, this Tuesday and Wednesday night at 721 Broadway.