
Daniel Tammet is a functional autistic savant with synesthesia. He knows 10 languages and can learn a new one in a week. He holds the European record for Pi digits memorized–22,514. For him, each number up to 10,000 has shape, color, even emotion. Squared numbers are symmetrical. Primes are smooth and round, like “pebbles on a beach.” Most incredible is how he multiplies, shown above. He pictures the shapes for two numbers side-by-side in his mind. Between them, in the negative space, a new shape forms. That’s the shape of the result.
WHAT??? For that to work, each number (like, up to 10,000) needs to be properly shaped such that multiplying any other number by it creates the right shape. This seems to mean these shapes follow some bizarre set of rules that I doubt Daniel could have created subconsciously. I dunno. This completely blows my mind.
Give him a google, a youtube, or listen to him on NPR, which also has the first chapter of his book (which I’ve read—interesting, easy read).