Gecko Foot vs Suction Cup vs Sticky Tape

A close-up look at a climbing robot's toe pad, comparing three attachment strategies side by side. Gecko-inspired setae generate adhesion through van der Waals forces alone: drag the peel-angle slider shallow to bend the branched hairs flat and watch the force climb, or steep to peel them clean off with nothing left behind. Switch to a suction-cup foot to see it fail the instant the wall turns rough or dusty, or to a sticky-tape foot to watch its grip visibly fade after repeated attach/release cycles — while the gecko foot's force holds steady no matter how many times it cycles.