Article: Mathematics scrapbook.

Blue Wednesdays

British writer Daniel Tammet has synaesthesia, a rare mixing of the senses where numbers and emotions collide. Two years ago Tammet became famous for reciting [pi] to 22 514 places. This extract from his recently published book Born on a Blue Day: The Gift of an Extraordinary Mind (Hodder & Stoughton 2006) is a glimpse into the numerical mental landscape he inhabits.

I was born on January 31, 1979--a Wednesday. I know it was a Wednesday because the date is blue in my mind and Wednesdays are always blue, like the number nine or the sound of loud voices arguing. I like my birth date, because of the way I'm able to visualise most of the numbers in its ...

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