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Okay, I acquiesce. We went back and watched the segment again. The announcers did say that it was human powered.
I am still not sure how they could go from the blocks being flat on the ground to what appears to being over six feet (or so) tall - I guess they had the platform lowered a bit. Some of the movement of the blocks still appears mechanical to me (rather than just human movement). But the people were under there providing the movement.
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