As someone who cannot handle the sky glider at the Santa Cruz Beach Boardwalk (much to my children's mocking merriment), obviously there is absolutely no way I'd consider doing this:
Visitors to the Sears Tower's new glass balconies all seem to agree: The first step is the hardest.
The balconies are suspended 1,353 feet in the air and jut out four feet from the building's 103rd floor Skydeck. Their transparent walls, floor and ceiling leave visitors with the impression they're floating over the city.
There's also no way I could watch people do it. I could not even finish the accompanying slideshow that featured kids enjoying the view.

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