Synesthesia
Another video that Beyza pointed out to me. Apparently Synesthesia means: syn·es·the·sia syn·aes·the·sia (sĭn’ĭs-thē’zhə) n. A condition in which one type of stimulation evokes the sensation of another, as when the hearing of a sound produces the visualization of a color. A sensation felt in one part of the body as a result of stimulus [...]