What is the theme in Born on a Blue Day: Inside the Extraordinary Mind of an Autistic Savant by Daniel Tammet?

Numbers play a significant role throughout the book. Numbers provide stability for Daniel, numbers connect Daniel to the "normal" world, and Daniel's relationship with numbers creates a new language for communication between author and reader. For Daniel Tammet, numbers are more than just characters on a page used to count with or figure out how much something costs. Daniel's savant syndrome gives him the ability to transcend traditional languages and speak to others in his own form of language while still being completely understandable and relatable.