Sometimes our brains do funny things. Take this study, for example, in which scientists blindfolded 13 people for 96 hours (four days) and had them record everything they "saw". Ten participants had visual hallucinations, some of them incredibly vivid and intense, all of which began within the first day of wearing the blindfold. Many hallucinations were of lights and shapes, though some were more elaborate (see below for complete descriptions of many of the visual "trips"). But in every case
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