I've never attempted that.
But, I am a master at dancing and running in place on top of the balls.
English
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I've done extensive studies on that. As it can be observed in figure 1 above, the ball runner has a different perspective than the onlooker. It seem the ball may not appear where it should be to onlookers. This could indicate a problem in the continuum between space and time in the Tower o_O