Prairie sunflower, Helianthus petiolaris, designed by nature. Unibug 1.0, designed by Mark Tilden. Although built of simple, off-the-shelf components, it can walk easily on a remarkable variety of surfaces, striding from a film of shallow water into deep sand without stumbling. Seen here striding over a sand dune at Great Sand Dunes National Monument in south central Colorado. From the book Robo sapiens: Evolution of a New Species, page 240.