These include complex tools (which require several stages of manufacture), symbolism (for example, red hematite pigments for notation and beads for display, made from sea shells and ostrich eggshells), and long-distance networks of contact and exchange. These discoveries support some archaeologists’ view that only Homo sapiens was advanced enough to be considered truly modern humans, while non-modern groups like the Neanderthals displayed, at best, only incipient signs of such complexity.