One more trivial example is that of synesthesia. It generally means that one sensation (like reading text) is directly and involuntary felt through another sensory channel (like seeing colours).
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In one common form of synesthesia, known as grapheme → color synesthesia or color-graphemic synesthesia, letters or numbers are perceived as inherently colored,[5][6] while in ordinal linguistic personification, numbers, days of the week and months of the year evoke personalities.[7][8] In spatial-sequence, or number form synesthesia, numbers, months of the year, and/or days of the week elicit precise locations in space (for example, 1980 may be "farther away" than 1990), or may have a (three-dimensional) view of a year as a map (clockwise or counterclockwise).[9][10][11] Yet another recently identified type, visual motion → sound synesthesia, involves hearing sounds in response to visual motion and flicker.[12] Over 60 types of synesthesia have been reported,[13] but only a fraction have been evaluated by scientific research.[14] Even within one type, synesthetic perceptions vary in intensity[15] and people vary in awareness of their synesthetic perceptions.[16]
I often try to imagine things like that. Once, because I can relate to some of these synesthesic perceptions, but also because I think one can train to think (and feel) outside the box.