Horrified onlookers watched as the helicopter hit the crane amid low cloud and fog near Vauxhall station, south of the river and not far from landmarks such as the London Eye and the Houses of Parliament, and came plunging to the ground.

CNN: London helicopter crash prompts safety questions

While designing the sequences, Villareal had to address practical issues like safety for passing boats and drivers on the bridge, as well as artistic considerations such as making sure the animations were viewable from up close, below the bridge, and as far away as Twin Peaks, where the bridge can been seen on fog-free nights.

CNN: San Francisco turns a bridge into art with 25,000 lights

Even tiny delays, like the extra time pilots spend trying to find the right taxiway in the fog at O'Hare in Chicago, can add up to huge backlogs as far away as New York as controllers order delays in takeoffs.

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