So I’m stretching the term “nature” here because when I was posting this I actually completely forgot about real natural clay by rivers. You can also get workable clay from any large amount of sand over dirt that’s gotten wet enough times. The water pulls silica out of the sand and into the earth over time, then you can wash it to get the extra crap out, decant off the water, dry the slip, and boom clay.

Some of the best clay I’ve used came from under an old school playground.