Pushed to GitHub at https://github.com/gamecubate/re-frame-physics .

Question: am I making a mistake if I credit re-frame to @mikethompson ?

It seems self evident that he did create re-frame. Just want to be careful not to offend anyone when I write "Mike Thompson's re-frame" in my README.

@gamecubate, cool demo. And about core.match: pattern matching is built in and pretty common in erlang and haskell, I’ve asked about it on another channel and here is an interesting thing one has to consider: https://clojurians.slack.com/archives/C03S1KBA2/p1493919471137539

@gamecubate yes, it was me, Your Honour :-)

Indeed my honour. 😀

Will definitely look it up at next refactor; so far pattern matching has not been an issue but about to add a bunch of joint (Box2D) types to the specification vocabulary so am likely to bump into just what match was made for.