An invisible wall or invisi-wall is a video game term for a boundary that limits where a player can go in a certain area, but doesn't appear in-game as any kind of visible obstacle, or as an obstacle that in reality could easily be bypassed, such as a mid-sized rock or short fence. In 2D games, the edge of the screen itself can form an "invisible wall", in that a character in play may be prevented from travelling off the edge of the screen. In 3D games, invisible walls are used similarly to prevent a player leaving the gameplay area. This is often done in preference to using a more visible boundary, as this can reduce the realism of the environment.
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Famous quotes containing the words invisible and/or wall:
“Our dreams are a second life. I have never been able to penetrate without a shudder those ivory or horned gates which separate us from the invisible world.”
—Gérard De Nerval (1808–1855)
“[Religious establishment] is adverse to the diffusion of the light of Christianity ... [because] with an ignoble and unchristian timidity it would [be] circumscribed, with a wall of defence, against the encroachments of error.”
—James Madison (1751–1836)