Via Smart Mobs:
Researchers are working on "information rain", taking advertisements to the realm of mock meteorology.
A projector on a tall tripod shows images of raindrops hitting the ground and making ripples, in hopes that people will enter the "rainy" area and hold out their palms.
A camera tracks the entrants' movements and sends the data to connected computers. Then the projector shoots out a round-shaped advertisement -- which can post words such as "SALE" -- right onto their hands.