Santa Cruz, CA-based artist Jim Denevan makes freehand drawings in sand, laboring up to seven hours and walking for as many as 30 miles to create artwork using no measuring aids whatsoever. (Click images for detail.)
From above, the drawings are abstract patterns. But when looked at from the ground level, they take on a new form, challenging ideas of distance and perspective. Then, heartbreakingly, they get washed away. At least everything is beautifully documented on film first.