No offense, but clearly no good deed goes unpunished on Hacker News =)

Notwithstanding opinions on the merits or lack thereof of abstracting and visualizing concepts that may or may not help your syntactical understanding of algebra, I want to point out that this is A) a brilliant idea and B) a really cool implementation.

Kudos to the developer who spent the time to implement this, and to Brett for putting the idea forward. I hope this gets traction and is continued to be built upon.