Murmp

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.

"It's like walking on ice," said Margaret Kemp, of Bishop, Calif., who said her heart was still pounding even after stepping away from the balcony. "That first step you take — 'am I going down?'"