I used to work in a proprietary concatenative/stack language that was used for the GUI front-end for medical software. I wrote a Mandelbrot in it that used zero

I used to work in a proprietary concatenative/stack language that was used for the GUI front-end for medical software. I wrote a Mandelbrot in it that used zero variable names, just two functions with a recursive call. It was beautifully terse and dense. That sort of language is really satisfying for that sort of problem.