Normally I don't like 3-D but in this case it allows you to see the intricacy in the drawings in the cave, the movement. The movie is a meditation as well as an exploration within our history and ourselves. We become the silence in the cave; we are the artists.
At one point, those in the cave said they felt the eyes of the artists upon them. There is a unity in time. Here's the trailer to entice you in:
This is Jon Carroll's comment on the movie: