There's a man whose brain sees numbers with shapes, colors and feels. He can recite over 22k digits of Pi!
Savants are fascinating to observe because their brains are so incredible. While completely incapable of performing some tasks, they are so incredibly amazing at doing others that it has captured worldwide attention.
Daniel Tammet is one of these savants, who claims that numbers result in an emotional result in each person. For example, he claims each positive integer up to 10,000 has it's own shape, color, and feel. The number 289 is extremely ugly, while 333 is strangely attractive. Pi he describes as beautiful. 9 is large and towering, while 25 is fun and would be invited to a party.
This may sound bizarre to most of us, but to a savant it makes perfect sense. Tammet currently holds the world record for reciting the most digits of pi at 22,514, and taking only a week per language, learned Romanian, Gaelic, Welsh, Icelandic, and six others!