I wrote a 64-bit clock that would just flip one bit on a 64-square grid every tenth of a second. I was kind of happy that at some point in maybe a few billion years, that clock would show a smiley face or something like that.

This is also how I got to read about Beckett-Gray codes. Needless to say I didn't find a 64-bit Beckett-Gray code, though I did try a little bit.

The thing ran in Flash, so, that's that.