Various forms of Synesthesia

https://www.thesynesthesiatree.com/2021/03/number-form-synesthesia.html

Number-form synesthesia

Also occasionally called number-space synesthesia

People with this type of synesthesia perceive numbers as a sequence visualised spatially, around them or in front of them. The spatial positioning is highly consistent and tends not to vary throughout the synesthete’s lifetime. For many of these people, each number also has its own colour (so number-form coexists with grapheme-colour synesthesia in this case), or their number maps have shading effects. These synesthetes frequently visualise the numbers spatially in relation to themselves, with a perspective that varies according to the number they have in mind at any given time. The maps are three-dimensional and assume many different forms: they can be straight or curving, with one or more changes of direction, with right angles, peaks and dips, spirals, zigzags, steps or ladder-like structures, going from right to left or vice versa, climbing up or disappearing on the horizon as the numbers get larger, and they may look tidy and well-organised or appear chaotic, only making sense to their “owner”. In any case, it can safely be said that there are as many spatial numerical maps as there are number-form synesthetes, as this type of synesthesia is just as idiosyncratic as any other.

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Posted because I have number-space synesthesia. Stumbled upon it one day as i wondered if my visual of numbers was anything unique. I think I got it from a childrens' book on numbers. My 1 to 10 and 20 to 30 and 30 to 40 up to 100 repeat, and then 100 to 200 looks like 1 to 100. But 1 to 10 also looks like 100 to 1000. And so on.