A fake floor is a map design technique where a sector forms a pit with no textures on its walls. This creates an illusionary floor above the height of the actual floor. Among other uses, this visual oddity can be implemented in a relatively deep pit to hide monsters which are raised to attack the player or in a shallower one to add a deep-water effect.
A notorious joke WAD called Wow uses this effect in a comical way, calling a fake-floor pit the player may fall into an illusio-pit.
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