"Everything’s in 3D these days, so why shouldn’t Tetris get the X/Y/Z treatment too?
Researchers Peter Barnum Srinivasa Narasimhan, and Takeo Kanade at Carnegie Mellon University have come up with a way to project 3-dimensional images onto multiple curtains of water to form a volumetric display. The system uses layers of water dripped from tiny needles and slightly offset from each other. A single projector rapidly alternates images between the different water curtains to form a single image. Since there are four separate layers hanging in space, you can actually view the 3D effect without glasses."
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