In the grand scheme of things this video should have been the very first to be posted here. THIS is from the tape in which Chief and I learn that Horizons is going to close (again) so we head out to get a couple of rides on tape.
What you're about to see is the evolution of how we went from normal behavior to our exploration phase. It's like watching two apes at the very moment they learn to use a stick to eat more ants. All of a sudden the Monolith appears. The two apes start to walk erect and use more advanced tools............and climb right out of their ride vehicle!