Eddie — this looks really nice! Could you set up a docker image that runs Darkmatter to make it easier for people to check it out?

My group is adding Jupyter widgets to cl-jupyter (with Frederic Peschanski’s help). We set up a docker image that we use for development and for testing (see: https://hub.docker.com/r/drmeister/cando/). I’d be happy to help you set one up for Darkmatter.