Without glue

This feat was done without using any glue at all. How on earth was it possible?
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on Tuesday, April 7th, 2009 at 12:02 am and is filed under Problem.
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April 7th, 2009 at 6:51 am
How “on earth”? you say. http://www.dailymail.co.uk/news/article-443560/Grand-Canyon-observation-deck-reaches-dizzying-heights.html
April 7th, 2009 at 7:45 am
pretty impressive. Gonna have to try that myself (the quarters; not the canyon viewing platform)
April 7th, 2009 at 8:08 am
I blame gravity.
April 7th, 2009 at 11:40 am
Another nice find, Jan.
The structure is a collection of coins. No coin is situated such that it will fall; for every bit of force “trying” to tip a coin over, there is a corresponding bit of force keeping it in place. Thus, the structure stays.
It makes me think of the keystone. http://en.wikipedia.org/wiki/Keystone_(architecture)
April 7th, 2009 at 11:41 am
Hmmm … http://en.wikipedia.org/wiki/Keystone_(architecture)
April 7th, 2009 at 11:43 am
Sigh … the “_(architecture)” is part of the link.