The audience seated at 45 degree angle would only be able to see one foot clearly. What anybody like David Blaine has to do is to lift one foot above the ground just a few inches while balancing on the second foot. As the foot in front of the viewers is lifted, performer balances himself on the toe of the second foot – one that is not in front of the audience. The synchronicity of the action creates the deception of levitation. A little practice of the trick and you are ready to go. Magician
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David Blaine levitation revealed