system glitch or optical illusion:
If you put a tree about 10' in front of you, and between you and a large building. The building say 20′ to 30′ behind the tree. Then move your body up and down in a circular motion, head and all. You'll know if your doing it right cuz you'll feel silly doing it! You will see the tree does not move but the building does.
Is this a glitch in the system or just an optical illusion?
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