I have found the perfect mathematical use for log cabin knitting: The Golden Rectangle.
The last square would be a booger, but I feel this must be done. The 21-square can't be done in one piece, but this totally can.
It's half-past midnight. I'm two repeats through a dishcloth and have a sweater and a sock part-finished in a bag. I've been unable to focus on anything for two days. I'm eyeing the cheap acrylic stash and wondering if I'm finding this idea so irresistible that I can't wait till tomorrow and the promise of better yarn at half off.
Maybe I'll just swatch a little. Do the first three squares or so. I don't have a problem...