The British Airways London Eye, or simply the Eye for short, is a giant ferris wheel on the banks of the Thames constructed for London's Millennium celebrations. Also known as the Millennium Wheel it is the largest ferris wheel in the world at 135m high. Designed by architects David Marks, Julia Barfield, Malcolm Cook, Mark Sparrowhawk, Steven Chilton, and Nic Bailey, the wheel carries 32 sealed and air conditioned passenger capsules attached to its external circumference. It rotates at a rate of 0.26 metres per second (about 0.9 km/h or 0.6 mph) so that one revolution takes about 30 minutes to complete.