Remember those science kits that let you power a clock with a potato? Caleb Charland, an artist and photographer, took the same principle and applied it to a bunch of live apple trees. In the resulting image, you can 'see' the power of the apple trees. (The trees don't generate that much power -- he used long exposure photography to really make the image come alive.)
More, including bigger images, at Charland's website.
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