I'm not sure. I don't see colors on a page like others do, and I'm not convinced that my brain is somehow abnormal. Your idea of smell remapping is very intere

I'm not sure. I don't see colors on a page like others do, and I'm not convinced that my brain is somehow abnormal. Your idea of smell remapping is very interesting. If I understand you, maybe some sort of biofeedback device can stimulate the sensation. Deaf people use voicemapping software to help them biofeedback their pronunciation. There are three times in early life when I remember noticing the effect very strongly: when my sister first taught me to sing harmony (age 3 or 4), when I first heard outre jazz (7? I didn't like it) and when I first really paid attention to Bach (8 or 9). Each time I was in a receptive mood and I was confronted with novel stimuli. There is also a lot of anecdotal evidence for synaesthetic "hallucinations" brought on by drugs, exhaustion, or sensory deprivation. Maybe there are some clues there. And if all else fails, there's probably a synaesthesia-mode for Emacs. :)