It has long been thought that Ice Age cave paintings could provide a window to our past, but their meaning has remained a mystery. Now, using research into hallucination, the dances of the Namibian bushmen and South African rock art, experts are beginning to decode these stunning pictures. Why did our earliest ancestors leave the trees and start to walk on two legs? What were early people like? Did they have language? Were they predators or prey? Ape-Man tells the remarkable epic of our 5-million-year journey from ape to man.