jsalvatier comments on How is your mind different from everyone else's? - Less Wrong Discussion
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I visualise numbers in a strange way. All people with whom I have talked about this (there weren't many) said to visualise numbers on a line or a circle. My image, on the other hand, has many sharp turns. I have put it here. The round turns in the picture aren't visualised as such; instead when thinking about numbers lying there, the whole picture turns around to maintain orientation while keeping the curved sections straight.
One of the Seattle LessWrong meetup attenders described his mild synesthesia in the same way you've described and claimed he read a book about people having similar number lines (with cultural differences).
It was these essays (The Visions of Sane Persons and Visualised Numerals), linked from the number form wikipedia article.
I think the cultural differences thing was just my conjecture, because the recorded number forms (as well as my own) often had turns at twelve and then subsequently at the decades, which led me to believe that they were probably based on the cadence of counting in English (one, two, three... ten, eleven, twelve, thirteen, fourteen... nineteen, twenty, twenty-one... twenty-nine, thirty, thirty-one, etc.). Whereas a Spanish speaker might be likely to develop a number form with a turn at 15 instead of 12, and a Chinese speaker to develop one with turns just at the decades.
Suppose that you don't remember what book it was?
I've asked him, and I'll post here when I hear back.
Thanks.