The World Wildlife Federation recently launched an awesome billboard campaign in Canada concerning changing ocean levels.

Using “celestial mechanics” similar to the way a sundial works, a scalloped awning over the billboard casts a shadow, creating a rising water effect over the course of the day.

Here’s an explanation:
“The board respects celestial mechanics (Kepler Rocks!). It’s perpendicular to the equator, with an unobstructed exposure to the west. The “waves” start at about 12:00. The challenge was not azimuth (the daily path of the sun), but altitude, which due to the Earth’s tilt, required the scalloped awning’s shape to be distorted to compensate for 43N latitude, during the life of the posting (about 8 weeks). Thanks to CBS Outdoor, and PLEASE support the WWF.” - YouTube user LowerC02

The video below really captures the elegance and cleverness of the advertisement.

via: TrendHunter

another very clever YouTube-inspired ad to promote blood donation: http://www.blographic.com/divers/thank-you