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A prominent element of psychedelic experiences is visual alteration.[5] Psychedelic visual alteration often includes spontaneous formation of complex flowing geometric visual patterning in the visual field.[6] When the eyes are open, the visual alteration is overlaid onto the objects and spaces in the physical environment; when the eyes are closed the visual alteration is seen in the "inner world" behind the eyelids.[6] These visual effects increase in complexity with higher dosages, and also when the eyes are closed.[6] The visual alteration does not normally constitute hallucinations, because the person undergoing the experience can still distinguish between real and imagined visual phenomena, though in some cases, true hallucinations are present.[5] More rarely, psychedelic experiences can include complex hallucinations of objects, animals, people, or even whole landscapes.[5] Visual alterations also include other effects such as afterimages, shifting of color hues, and pareidolia.