Artist Andres Amador works with one of the biggest canvases known to man: beaches. His works can span 500 x 300 feet and are raked into the sand in a race against the tide.

He patiently waits for a full or new moon so that the low tides offer him enough time to realize his vision. And just a few hours later, the work is washed away - leaving the beach looking as if nothing had ever happened.

Andres has raked over 100 'doodles' onto beaches in the San Francisco Bay area over the past 5 years. His method invovles simulating the image on a computer using a hand-drawn original from his sketch book. Once he's happy with the look, he reverse engineers the design and figures out how to etch it in sand.

Similar to Andy Goldsworthy's approach, Andres is philosophical about the transient nature of his art: "Once I have finished a piece and can get up on the overlook to see my work and take photos, I completely let go of it."