The Metaphysics of Speed Limits

(define (speeding-fine speed) (cond [(< speed 100) 0] [(and (>= speed 100) (< speed 120)) (* 3.00 (- speed 100))] [(and (>= speed 120) (< speed 130)) (* 4.50 (- speed 100))] [(and (>= speed 130) (< speed 150)) (* 7.00 (- speed 100))] [(>= speed 150) (* 9.75 (- …

Hexagonal Cross Stitch

At least year’s Bridges Conference in Stockholm, I attended a short presentation by Susan Goldstine about “self-diagramming lace”. As motivation for the new work she was presenting, Susan referenced her paper from the year before on what she calls “symmetry samplers”. Samplers are an old tradition in fibre arts. A …

The Tactile libraries

I developed a new open-source software library for manipulating isohedral tilings, based on the work I did on this topic during my PhD. The library is available in C++ and Javascript, and I offer a few fun automated and interactive demo programs that anybody can use to play with isohedral tilings.