Brain Snacks: Tasty Tidbits of Knowledge
Just because two synesthetes see numbered colors, doesn't mean they see the same color. One might see a three as purple, while another thinks it's orange. (Source.)
Wassily Kandinsky—the artist Mia mimics in the book—actually had synesthesia. He would see colors in music, just like Mia. (Source.)
The author actually writes out notes and ideas in a spiral notebook before sitting down at a computer. That way, there's a direct passage from her brain, she claims. (Source.)