200 images from the Internet were released into the sky via red, green and blue helium filled balloons on the 2nd of October 2005 in Victoria Park, London. For all we know they could all just fall into the Channel. But we hope that if someone finds an image they will get back to us and let us know where they are, and participate by sending us an image or message of their own.
-- DESCRIPTION FROM THE "IMAGES IN THE SKY" SITE