A squatter "shack" that bulges like a tumor off the outside wall of a Mexico City museum is an experiment in living _ or an eyesore, a waste of money, an affront to the country�s millions of real squatters, depending on whom you ask.

Whatever it is, Hector Zamora�s work of art is hard to ignore. It crawls down the side of the Carrillo Gil art museum about 30 feet above street level, reachable from the sidewalk only by a rickety wooden stairway.

Zamora, 29, says the red cocoon-like shack is a three-month experiment in living in a public space, a technical exploration of lightweight buildings and an opportunity to "spark a discussion."

"People have left me angry notes in my mailbox saying, �I hope someday you live in real poverty,� and �Now I know where the arts budget is going,�" said Zamora, a designer who builds canopies and pavilions.

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