Robot Carnival: Cloud (1987)

Directed by Mao Lamdo. This short features a robot walking through time, and the evoultion of man. The backdrop is animated with clouds that depicts various events of the universe. Such as the modernization of man, to the self destruction of man. Most the events in the backdrops takes place from Rome to present day society. Eventually the same angel who cries for his imortality, makes him human towards the end.