Shake your avatar!
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Left click to change the origin of layer 1
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Right click to change the origin of layer 2
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Slide horizontally to change the shake amplitude of layer 1
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Slide vertically to change shake amplitude of layer 2
On parameter settled, a series of image grab saved to /tmp/Shaker_*.ppm, by default 30 frames in 1 second.
To get an gif, try convert Shaker_*.ppm Shaker.gif
