Of course, Tom's intentions were less than noble; he was conning the other boys into painting his fence. But the observation holds up anyway.

Everything on this page started as work. Learning a new tool, keeping skills current, doing the sensible thing. Somewhere in the building, it turned into play: the kind you are not obliged to do and can't quite stop doing.

These are small, interactive computer science pages. Each one takes a single idea and makes it something you can poke at, break, and watch run.

So here's the fence. It's more fun than it looks, and you don't have to take my word for it. Take a brush.