Powaqqatsi

In the beginning chapter, Serra Pelada, men from Serra Pelada (a gold mine in Brazil) are seen carrying bags of dirt up to a destination. In the middle of the chapter, various shots outside of Serra Pelada are shown. Near the end of the chapter, a few men are carrying another man who was struck by a falling rock (mentioned in the "Impact of Progress" feature on the DVD/Blu-ray) uphill along a procession of workers who are carrying dirt-filled sacks. After that, several discordant layered exposures of the dirt carriers are shown. The scene cross fades to show the image of a head, with multiple exposures of the same head rapidly rotating and layered upon to give a manifold appearance. This is an apparent allusion to Janus, the god of beginnings, endings and transitions, keeping with the film's central themes of progress and change.