Really awesome effect! If author is here, would love to hear more about the 'deformation function' mention - is it a fractal height-map type approach that splits each line of polygon and deflects?
Author here. Thank you! Yes, I think you have the basic gist of it. Split each line, then move an endpoint. There's nothing too complicated about the algorithm, the trick is really around fine tuning all of the possible parameters. If it's not obvious, my approach is purely going after aesthetic effects.