(Author of the above article) I learned the polar representation, yep, but didn't connect as i as an "rotation operation" that took you from one dimension to t

(Author of the above article) I learned the polar representation, yep, but didn't connect as i as an "rotation operation" that took you from one dimension to the other. For all I knew, having i be 2-dimensional was like saying "We can represent condiments by having an axis for ketchup and and an axis for mustard". It was 2 random quantities represented as an (x,y) pair, without the notion that they were deeply connected.