I can report a similar visual. Mine isn&#x27;t wavy, it&#x27;s straight line from bottom left to top right in which each unit has a sort of notch division.<p>Aaaaand having to actually explain it seems to have completely messed the whole visual up. At this point I feel like I&#x27;m inventing a system based on childhood memories...<p>It does stretch back to my childhood though. I have strong memories of visualizing numbers in class, even specific problems like when we were asked to add all the numbers from 1 to 100. A problem in which I mentally drew half circles from 99 to 1, 98 to 2 and so on. I solved it almost instantly and thinking back I&#x27;m a little disappointed my teacher didn&#x27;t investigate this more and help me explore this skill.