Spelunkers exploring the karst mountains of East Kalimantan, Borneo, have discovered a cave system containing Paleolithic hand stencils and abstract geometric patterns. Initial uranium-series dating suggests the art could be at least 40,000 years old, placing it among the oldest examples of figurative art in the world. The pigments, made from iron-rich ochre, remain vibrant despite the humid tropical environment.
The discovery reinforces the theory that the development of complex symbolic behavior occurred simultaneously in Europe and Southeast Asia. Researchers are now analyzing the patterns to see if they represent early lunar calendars or clan signatures of the first human inhabitants of the island.