for scene 16 of the video " Big Bang Blow-Out 1: Entropy versus Anti-entropy" by Rolf Witzsche
here for a larger image
Light is a propagated stream of individual entities
When a fast train drives through a station, its whistle is of a higher pitch when it approaches the station, and of a lower pitch when it moves away from the station. This is so, because a sound wave is a disturbance in the air that reaches an observer's ear at a different rate by approaching or departing. In sound, the shifting pitch is normal, because sound is a disturbance in the air, while light is not a disturbance, but is an individual object, a discrete package. A beam of light is a propagated stream of individual entities.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.