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The suction cup(concave shape) and the vacuum seal between the (flat)surface of the ex:wall and the cup when the air is removed under the cup by the pressure you exert on it then forms a seal to keep the air out and the(rubber/elastic) cup tries to return to it original shape creating a vacuum until the seal is broken allowing the cup to return to it's original shape.if i read this page right.forums.randi.org
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