Brilliance.

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 applied to another, as in referred pain.

The description of one kind of sense impression by using words
that normally describe another.