Imagine a screen that quickly rotates around your body drawing images in 3D that require no glasses or added gimmick. A group from the University of Tokyo have developed such a machine. Not only does the machine display interactive 3D imagery all around you, it also takes video of at the same time. The result is that people across the globe can feel like they are really standing right in front of one another.
Inside the 1.2 meter (4 ft) tall, 2 meter (6.5 ft) wide cylindrical display are 50,000 LEDs arranged in columns. As the display rotates around the observer’s head at a speed of 1.6 revolutions per second, these specially arranged LED columns show a slightly different image to each of the observer’s eyes, thus creating the illusion of a 3D image. In other words, TWISTER tricks the eye by exploiting what is known as “binocular parallax” — the apparent difference in position of an object as seen separately by the left eye and the right eye.
[From Pink Tentacle ]