Daniel Tammet is a savant, but not quite the kind portrayed by Dustin Hoffman in the 1998 film Rain Man : he can function socially and describe what he experiences as he performs mind-boggling feats. In 2004, he recited pi to 22,514 places (it took 5 hours 9 mins). He learned conversational Icelandic in one week. Check out an interview that Morley Safer did way back in 2007, here : CBS ’60 minutes’ interview. Daniel says he sees numbers as colors and shapes. His book ‘Thinking in Numbers’ has been published recently, and shown here on TV on Monday, and so I am going to buy it.