synesthesia

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this friend of mine is normally perceiving things by associating them to a colour, a sound..sometimes to touch and more. Her perception, as she descibes it, is like a flux of experiences involving all the senses at once : if she sees something - for example- she will connect this vision to a color, and to a smell etc. I've personally experienced synesthesia for a few times in my life, also in a pretty strong way I believe- but it was always lasting some short time. I still have some doubt about the possibility of perceiving the world the way she says on a normal everyday basis, not as a climax in perception, but as a usual condition. What do you think, do you know any other case like this?