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April 17th, 2013, 07:52 AM  #1 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,412 Thanks: 1024  What's the "trick"? 
April 17th, 2013, 04:12 PM  #2 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: What's the "trick"?
Nice, how can 63 squares turn into 66 squares? 
April 17th, 2013, 04:44 PM  #3  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: What's the "trick"? Quote:
 
April 17th, 2013, 07:26 PM  #4 
Math Team Joined: Apr 2012 Posts: 1,579 Thanks: 22  Re: What's the "trick"?
Biertijd indeed

April 17th, 2013, 10:59 PM  #5 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: What's the "trick"?
I wonder what we would see if we had the overhead view, there may be a gap along the 'sliding diagonal' after he reassembles the object with the 3 tiles missing. We can't see it because of the perspective offered (delberately) I have seen other rearrangements where you get more squares but the ones i've seen have different figures, he appears to get more squares out of the same figure. 
April 18th, 2013, 04:16 AM  #6 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,412 Thanks: 1024  Re: What's the "trick"?
Somebody noticed this: Notice edit at 0:37. The 2nd piece removed is substituted with bigger piece. See how badly the uper edge lines up on the mat, compared to in frame. The rest is done with slightly discontinuous straight lines. Nice effect! 
April 18th, 2013, 07:23 AM  #7 
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: What's the "trick"?
I noticed two edits, at basically the same place in the construction/deconstruction

April 18th, 2013, 01:51 PM  #8  
Math Team Joined: Aug 2012 From: Sana'a , Yemen Posts: 1,177 Thanks: 44 Math Focus: Theory of analytic functions  Re: What's the "trick"? Quote:
 
April 18th, 2013, 03:04 PM  #9 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: What's the "trick"?
I see the edits but i don't notice a size change between the board and the grid. He shakes the completed board 3 times. The 1st and 3rd times the shaking is identical as far as the gaps are concerned. The 2nd time with the 3 pieces removed, the gaps are slightly but noticeably larger. This leads me to think the man is legit. He somehow transferred the difference in area to the sides of the board so all you need is a long thin strip somewhere, (possibly a few long thin strips) to make up for the areas of the redacted pieces. I want to see the overhead perspective. Also, the bottom side closest to him doesn't look to be parallel to the top. 

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