I thought the author asked how you would visualize it as a circle. For me it’s an oblique rectangle. The integers up to a few thousand (and the big multiples

I thought the author asked how you would visualize it as a circle. For me it’s an oblique rectangle. The integers up to a few thousand (and the big multiples like thousand, million, lakh etc) have a definite shape to me. I remember trying to draw it as a kid (rather unsuccessfully). But when doing simple arithmetic (including simple rationals) I simply look up the answer. My college roommate was interested and observed that I literally flick my eyes around to find the answer. Learning the times tables always seemed like a weird idea — I just answered the questions when asked. I assume a lot of people do the same.