We find out where our ancestors artistically expressed themselves, plus we ask, how can we melt a potato?
Caves are rather non-portable.
Plus caves tend to last longer than many other types of media for art, other than stone carving which can be difficult to do. CliffordK, Tue, 16th Oct 2012
At Uluru (ayes rock) a natural rock formation was painted in prehistoric times to resemble a snake as well as the depiction of animals in nearby caves. syhprum, Wed, 17th Oct 2012
Well if it's not in a cave is it cave art? I've seen prehistoric art not in caves, but it's very rare as it needs to be protected from weathering and other forms of destruction, such as vandalism.
There is a lot of prehistoric art around in Australia, almost none of it in caves, though much is in rock shelters.
In Colorado, USA, there are hundreds if not thousands of petroglyphs that are not in caves. These petroglyphs are 200 to 14,000 years old and were done by native American Indians. Boogie, Tue, 30th Oct 2012
I'm sure caves are just the only places that the art survived. Surely they practiced on a rock outside first before going in. Some of the cave art is too impeccable to be the artists first stab at it. Adam Yax, Mon, 5th Nov 2012