Just a strange thing.
The global television audience of more than three billion people watched in amazement as a series of giant footprints outlined in fireworks proceeded through the night sky from Tiananmen Square to the Bird's Nest stadium - except they were watching a computer animation.
Even the giant television screens within the stadium itself broadcast the fake images.
Stunned viewers thought they were watching the string of fireworks filmed from above by a helicopter.
But in reality they were watching a 3D graphics sequence that took almost a year to produce.
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