Programmable Ink

Comments moved to https://news.ycombinator.com/item?id=33799512, which was posted earlier.

(This is a first-rate submission and I want to share the karma across the two submitters. Unfortunately we don't have software support for that yet, so I have to do it the crude way. Sorry nickmain! I've emailed you repost invites for a couple of other great articles you submitted.)