Oca is a striking exhibition pavilion in Ibirapuera Park designed by Oscar Niemeyer. Its white domed form is often compared to a flying saucer, and the building is one of the park's most recognizable pieces of modernist architecture.
The space hosts temporary art and culture exhibitions, so what you see depends on the current program. Even between major shows, it is worth noticing as part of a walk through Ibirapuera's Niemeyer-designed cultural ensemble.