From Wikipedia: Unreal ][ - The 2nd Reality (later known as Second Reality), is a demo created by Future Crew for the Assembly '93 demoparty. In the PC demo competition, Second Reality placed first with its demonstration of 2D and 3D rendering. The demo was released to the public in October 1993. It is considered to be one of the best demos created during the early 1990s on the PC, e.g. Slashdot voted it one of the "Top 10 Hacks of All Time."