Today I read a very fine story called The Empire of Ice Cream, a story from the Star Ship Sofa anthology. The vehicle for this story is synesthesia, a condition in which a person's senses are cross-linked. The protagonist's condition goes as far as figurative synesthesia, in which the cross-sensations form concrete hallucinations. When he tastes coffee, he enters the life of another synesthete. But which one is the illusion?
The story also speaks well to the social isolation of those who perceive the world differently. We all get the feeling of being misunderstood, but for most of us it's not constant and permanent. One in that position might think oneself mad, even if it wasn't true.
The story was nominated for several awards, and won the World Fantasy Award in 2004. I give it three stars