David Blaine: Human fishbowl

David Blaine interacts with spectators of all ages on day three of his week living underwater in an eight-foot acrylic sphere in New York City's Lincoln Center.

Those watching Blaine in his human snow globe on Wednesday afternoon seemed amazed by his living environment and asked questions like "Why is he doing this?" and "How is he going to use the bathroom?" To answer the latter, Blaine was equipped with tubes both for feeding and relieving himself. Although, according to his Web site, Blaine fasted for five days before going into the tank which "cleansed his body so he would have no solid waste while in the tank."

Blaine had a diving helmet on that allowed two-way communication with his support team.

The water in Blaine's tank was kept at a balanced temperature to help keep his core temperature near 98.6 degrees. Still, he did the stunt against medical advice and was reportedly having trouble sleeping, was getting perforations in his skin and had a constant feeling of "pins and needles."

Blaine said he chose Lincoln Center for his stunt because it's the location of the New York Public Library for the Performing Arts, where he spent time as a kid learning about escapologist Harry Houdini and other performers. "It was there that I first dreamed I might stage performance events that would be free to the public and that would challenge our mutual conceptions of what was humanly possible," he said.