Or as Wikipedia says,
a neurological condition in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathwaySo a person with Colour Synesthesia preceives numbers or letters as having an inherent colour.
5 could be purple or D could be black
Some have it from sounds so a French horn could be light green or a high soprano, white, sometimes with movement too.
Another one that is new to me is perceiving letters as personality types, e.g. U is pleasant but unexciting, F is frazzled, nervous.
Why is this relevant to writers, emerging or otherwise?
Synesthesia has been a source of inspiration for artists, composers, poets, novelists, and digital artists since the Greeks (the ancient ones, not the bankrupts of Europe).
When you are describing something, in a poem or fiction, dialogue or whatever, spice up that description by using a synesthetic adjective.
a spiky ring tone
a faithless wine
loud table lamp
a grumpy door
The artists Kandinksy was a synesthete, as is David Hockney, the writers Joanne Harris and Nabakov, musician Duke Ellington, Physicist and personal hero of mine Richard Feynman, composers Lizst and Rimsky-Korsakov.
I know of at least one Irish writer who has some aspects of it. Anyone reading this?