Synesthesia is a perceptual phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.
The texture and color of music
The light from the sun can have a taste
my mind is
a big hunk of irrevocable nothing which touch and
taste and smell and hearing and sight keep hitting and
chipping with sharp fatal tools
in an agony of sensual chisels i perform squirms of
chrome and execute strides of cobalt
nevertheless i
feel that i cleverly am being altered that i slightly am
becoming something a little different, in fact
myself
hereupon helpless i utter lilac shrieks and scarlet
bellowings
― E.E. Cummings
A Black, E white, I red, U green, O blue : vowels,
I shall tell, one day, of your mysterious origins:
A, black velvety jacket of brilliant flies
Which buzz around cruel smells,
Gulfs of shadow; E, whiteness of vapours and of tents,
Lances of proud glaciers, white kings, shivers of cow-parsley;
I, purples, spat blood, smile of beautiful lips
In anger or in the raptures of penitence;
U, waves, divine shudderings of viridian seas,
The peace of pastures dotted with animals, the peace of the furrows
Which alchemy prints on broad studious foreheads;
O, sublime Trumpet full of strange piercing sounds,
Silences crossed by Worlds and by Angels:
O the Omega, the violet ray of Her Eyes!
-Arthur Rimbaud