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by normac 3767 days ago
On the off chance you haven't heard of him, you might want to check out Daniel Tammet [1]. He's a high-functioning savant who has number-related synesthesia, can do calculations by juxtaposing images as you describe, and he's cultivated these abilities to the point that he can perform incredible feats of calculation and memorization.

[1] https://en.wikipedia.org/wiki/Daniel_Tammet