Quote:
Originally Posted by wdfifteen
Until the very last brick they laid at an angle and took up slightly more space on the wall than if they had been flat. Ie if they were 12 inch blocks they would be maybe 12 1/4 from upper left edge to lower right edge when resting at an angle. The bricks were spaced exactly 12 inches apart so there was no room for them to lay flat as long as the all were propped at an angle. When the last one fell it fell flat so it only took up only 12 inches, with more space, the second from last could then lay flat and now take up only 12 inches, which allowed the 3rd from last to fall flat, etc. etc. etc.
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Yes^^. Visualize each block as a
partially open door, hinged at the lower left corner. Being partially open, the
thickness of the block causes the upper edge (opposite of the pivot "hinge") to intrude into the space behind it where the previous block is. As soon as the angled block is allowed to fall flat,
that intruding corner moves forward, clearing the space behind it and the previous fallen block is allowed to fall, etc.