2001: A Space Odyssey

We are at the dawn of the humanity where apemen live a primary life, the day, in search of some food, disputing a point of water, and during the night, huddle against others in a cave, fearing darkness. This tribal life is going to be upset when to the first glows of dawn, a black monolith rises in the rockery.

This encounter marks a degree in the evolution of Man who discovers unthought of possibilities of  the tool. The tool also becomes an arm that allows them to stop starving, to reconquer so precious points of water and to establish a territory. The monolith comes to provide basic lines of the civilization to apemen.