Since I just reviewed a middle grade book about synesthesia, I wanted to highlight this picture book. It has non-fiction elements in a narrative format, telling the story of Jillian who could hear sounds and how she and others deal with this. Phrases such as “tickling touch” and “the wind in the pines blew soft gray” highlight the five senses. Vanessa Brantley-Newton‘s illustrations pop out on the page while Marie Harris gives a good explanation of synesthesia in her author’s note in the back.
Extend the interest by writing metaphors and studying the five senses.
An Education in Books Blog 
This sounds pretty fascinating to me!