A tilted room is extremely disturbing. It is hard to walk, and even to stand up. This happens when the visual sense provides information which does not agree with sensations from gravity. This is disturbing for astronauts living in a zero-gravity environment, and often causes severe disorientation illusions and space sickness. It also happens to pilots executing roll manoeuvres. Their disorientation can be so severe that they lose control and crash. It also happens to old people and people suffering from vertigo.
http://www.answers.com/topic/tilted-room
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