Michael explains how he does it. “The most fundamental element of balancing in a physical sense is finding some kind of “tripod” for the rock to stand on. Every rock is covered in a variety of tiny to large indentations that can act as a tripod for the rock to stand upright, or in most orientations you can think of with other rocks".
He says, "by paying close attention to the feeling of the rocks, you will start to feel even the smallest clicks as the notches of the rocks in contact are moving over one another. In the finer point balances, these clicks can be felt on a scale smaller than millimeters. Some point balances will give the illusion of weightlessness as the rocks look to be barely touching. Parallel to the physical element of finding tripods, the most fundamental non-physical element is harder to explain through words. In a nutshell, I am referring to meditation, or finding a zero point or silence within yourself. Some balances can apply significant pressure on your mind and your patience. The challenge is overcoming any doubt that may arise, it’s a fun way to relax, release stress, play, create… learn… all while challenging my skills and dabbling with countless possibilities…”
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Sourch and info : Michael Grab's Amazing Rock Talent.