Lascaux has a lower network of galleries, which once had its own entrance. At the end of this network lies a small chamber -- now only accessible from the main part of the cave -- where many generations of artists worked. One of them painted a scene, one of the few in Cro-Magnon art. A charging bison with lowered head, threatening horns, and raised tail confronts a falling human figure with outstretched arms, erect penis and a bird head. A barbed weapon has pierced the bison's hindquarters, which have been disemboweled. A bird on a stick, perhaps a spear thrower, stands below the falling bird-man. Scholars argue endlessly over the significance of this scene. Does it represent an actual hunting incident, or is this a symbolic depiction of the passage between life and death, where the bird symbolizes the flight of the soul from the dead? Rock art expert Jean Clottes points out that the location of the scene is a place that is very prone to high concentrations of carbon dioxide, which can cause both discomfort and hallucinations. ~ Page 220