Visual reorientation illusions
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Visual reorientation illusions or VRIs are 90- or 180-degree instant rotations of one's visual orientation. They often happen when coming out of dark rooms or passages. There is, however, a difference between VRIs and simple confusion. The VRI is a distinct perceptual event. One's bearings are known to be in a certain direction, and then they are instantly rotated exactly 90 or 180 degrees. One proposed idea is that they are connected to a hypothetical spatial fourth dimension. A far more likely explanation is that they are caused by brain malfunctions.
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