Anatomically modern Homo sapiens appears around 300,000 years ago, but "behavioural modernity" — abstract thought, symbol use, deliberate adornment, ritualised treatment of the dead — turns up in the archaeological record much later. A key threshold sits around 100,000–70,000 years ago and is defined by converging evidence from several sites.

Blombos Cave in South Africa preserves pieces of ochre engraved with grid-like patterns in layers roughly 75,000 years old; the same cave produced beads strung from sea-snail shells, with use-wear from being threaded together. Similar shell beads from Grotte des Pigeons in Algeria and Taforalt Cave in Morocco reach back 80,000 years. At Skhul and Qafzeh caves in Israel, anatomically modern humans from around 100,000 years ago lie in deliberate burial postures, with ochre, marine shells, and animal parts placed around them — the earliest known intentional burials in the record.

No single piece of evidence is enough on its own; together they form a pattern. The importance of symbols lies not just in their beauty: a string of beads, a body placed in a specific pose, a design on a piece of ochre — each is something abstract made tangible to be communicated to another mind. This pattern of behaviour would travel out of Africa with modern humans in the following millennia, onto cave walls, onto stone, into graves.