Your Vowels are Vermillion
The phenomenon of senesthesia has always fascinated me. The word first came into public use during the LSD era, when our college roommates were tasting music and hearing the clouds. Remember? My interest was piqued as I read about this condition of fused sensations, not fully accepted as 'real' at the time, because it seemed to me that there might be some way in which 'normal' non-senesthetes employed this cross-wiring in a creative way, while not overtly manifesting the true 'symptoms' of seeing numbers in colors, for instance.
My suspicions are (tentatively) confirmed by this (multi-page) article from Scientific American, that includes the following excerpt:
Our insights into the neurological basis of synesthesia could help explain some of the creativity of painters, poets and novelists. According to one study, the condition is seven times as common in creative people as in the general population.
One skill that many creative people share is a facility for using metaphor ("It is the east, and Juliet is the sun"). It is as if their brains are set up to make links between seemingly unrelated domains--such as the sun and a beautiful young woman. In other words, just as synesthesia involves making arbitrary links between seemingly unrelated perceptual entities such as colors and numbers, metaphor involves making links between seemingly unrelated conceptual realms. Perhaps this is not just a coincidence.
What's more, this condition tends to run in families, suggesting there is a genetic source that "could lead to both synesthesia and to a propensity toward linking seemingly unrelated concepts and ideas--in short, creativity. This would explain why the apparently useless synesthesia gene has survived in the population".
Cellophane flowers of yellow and green
Towering over your head
Look for the girl with the sun in her eyes
And she's gone
Like PsYcHeDeLiC, Man!