What is man's deepest desire? Eternity. The idea of life beyond death. Life does not just end but begins.
Darren Aronofsky's mind-bending romance sci-fi movie, The Fountain, involve three time periods--the age of conquistadores, the present, and the very far future. The common thing in all three time periods is the idea of eternity--the tree of life.
I really don't want to spoil the story, so I'd rather recommend this movie for sci-fi buffs and see what others think.