ZAGREB, Croatia - Ever feel like a caged animal? Visitors to Zagreb's zoo can find out what it is really like to be in a cage.

The zoo has set aside two partially furnished cages for humans labeled "Homo Sapiens." Visitors will be able to enter and leave at will. But the project, launched Friday by the head of the zoo, Mladen Anic, goes beyond offering a behind-the-bars experience to warn about human devastation of nature.

One cage is for "good man," and is furnished with things made of natural materials — bamboo chairs, and water and fruit displayed on a wooden table. The other, for "evil man," has materials that harm nature — plastic chairs, and garbage in the corner, with a note above the mirror reading: "The most dangerous beast on the planet." The "good" cage contains brochures on how to protect the environment; the "bad" one shows how it is being ruined.