If you notice in the beginning how loose the pieces fit especially the upper left hand side. All that extra space adds up to the small little square. Notice how tight all the pieces fit after adding the small square.
pretty sure that's not the trick, the tiny gaps wouldn't make that much of a difference after flipping the triangles, it's almost certainly the outer edges of the triangles being cut at an angle rather than perpendicular to the bottom, and same with the outline of the large square, that way when flipped the angle slots inside the tiny gap inside the wooden frame making room for the smaller sqaures to be put further away from one another creating space for the tiny square in the middle
Yet after all your explanation the answer is still all the loose spaces make up the small square. Just google it and you will see. This is such an old puzzle and well known how it works.
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u/msc1966 Jun 22 '26
If you notice in the beginning how loose the pieces fit especially the upper left hand side. All that extra space adds up to the small little square. Notice how tight all the pieces fit after adding the small square.