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Be sure to watch the entire video to see all of the patterns that are created. At the end of the video there are 2 links to watch 2 more versions of the video.
The effect works by using a formula that provides the specific length for each string. When all of the pendulums are started at once the patterns will start to form. The pattern resets after about 1 minute. There were 3 sources of light causing 3 shadows to appear on the poster board.
You can download this song on itunes:
Name of song "Soul Switch"
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