Natural landscape architect and garden designer Michael Littlewood of Somerset, UK. Designer of natural swimming pools. Author of Natural Swimming Pools, Inspiration for Harmony with Nature, available on his website.
DIY natural swimming pool - the video provided in the link is pretty cool. I've had dreams of these things, and now that I've seen an actual video I'm a bit kreeped out because I don't like swimming in dark water, but the pool itself is pretty awesome