Human consciousness is the most astonishing thing, and most of it happened in deep time, beyond the reach of any writing and most legends. Human experience, in general, is prehistoric. And prehistoric experience was just as full as yours and mine: just as deeply felt, just as intelligent, just as real. What we know of it is mostly from durable artifacts and graves. I’m thinking of the woman found near the Snake River, buried at the end of the ice age with a perfectly crafted and unused stone knife tucked under her head. I’m thinking of the huge conical hats, beaten from single pieces of gold and inscribed with calendars, found north of the Alps. I’m thinking of Grave 8 at Vedbæk, where a woman held her premature baby on the spread wing of a swan. These are snapshot that experts can assemble into larger ideas, but what they tell all of us is that we’ve been people, not just humans, for a very long time.