"Nothing in nature is digital," says researcher Mark Tilden, who created Unibug 3.1. "Everything's analog?and analog can do better." Unibug 3.1, a slight variation on the disassembled model pictured on page 116 is an example of what he means. 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. Los Alamos, NM. From the book Robo sapiens: Evolution of a New Species, page 120..