The key to understanding this phenomenon lies not in magnetism nor in any sort of mystical ability but instead in the physics of friction.

理解这种现象的主要方面既不是在磁性也不是在神秘力量而是摩檫力的物理性质。

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Then there's the Slide (pictured above) which relies on interesting physics to support the iPad: a heavy high-friction rubber cylinder is pulled out of its tubular compartment under the metallic slope, and it can be placed anywhere on the slope to support the iPad at any desired angle, up to somewhere around 70 degrees -- you can see it and the others in action in the earlier video.

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