I think we first read about "One small square" years and years ago in a Chinaberry review...anyway, we put the idea to use, and do the "one small square" investigations on a few different parts of our land. It's so easy to do...just pick a place, get a journal, a pencil, and a magnifying glass, and start writing. Even if the square is (as is so often the case up here) covered in snow, you can still write if you find tracks, or scat, or dead leaves, or even exhaust residue on your "square."
Awesome idea and easy to implement.
love, p