Clusters of handprints some 6,000 years old adorn the walls of Elands Bay Cave in South Africa.
"Hands are one of the things that define us as humans," archaeologist Dean Snow said. "We use them for all kinds of things, and they are symbolically important, not just utilitarian. Little wonder that we leave prints and stencils of them here and there.
"This cannot be anything other than one of our most fundamental means of expression."