Cantor Cantor did it until he was crazy. Catastrophe theorists do it falling off part of a sheet. Chaoticians Chaoticians do it with sensitive dependence. Class field theorists do it by capitulation. Classical geometers Classical geometers do it on the Euler line.
Classical geometers do it on the nine-point circle.
Combinatorialists Combinatorialists do it discretely. Combinatorialists do it as many ways as they can. Complex analysts Complex analysts do it between the sheets. Complex analysts do it under a universal cover. Computer scientists Computer scientists do it in loops.