Silent teleport

Silent teleport is a special kind of teleporter used to create an illusion of 3D or 4D in a level.

Its earliest known appearance was in Hexen (1996). After that it showed up in the Zombies TC (1997) to create, in MAP02, an illusion of a building 3 stories high.

In 2006 it was used to create the "impossible" architecture of Impossible: A New Reality, a Escher award winner from Cacowards 2006.