The Imaginarium is now rebuilt, complete with HVAC "borrowed" from the nearby CRAY supercomputer. The Imaginarium will once again become an integral part of ME101 Visual Thinking, a cornerstone of the Undergraduate Design Program.
The original Imaginarium used a projection system located beneath the floor that projected upwards through a fluid filled sphere. We built our first prototype to utilize the same system. However, it turned out that a projector mounted at the top of the dome pointed down onto a hemispherical mirror worked much, much better. Here's an early prototype of that, set to one of my stop motion music videos.