Apparently our friends were so addicted to the experience they've done it a few times since. It also looks like a mini-trend has caught on, as several other groups have been inspired to organise their own expeditions up the WFC.
Previous Shanghaiist stories on the World Financial Center
Fire at the World Financial Center
Skyscraper Envy: Shanghai to whip out another big one
As far as shapes go, the circle is the evilest
Blogging about the World Financial Center
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Listen: "Locust World", mean anti-mainlander song circulating in Hong Kong