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When the pieces put together to form a rectangle, the inner edges of the polygons do not fit together. The applet blurs the effect by adjusting the pieces ever so little. In an "honest" version of the applet the effect is clearly noticeable. It becomes obvious there how small an adjustment is really required.
Originally posted by davespanners
I was confused for a second there
Here is the explanation
When the pieces put together to form a rectangle, the inner edges of the polygons do not fit together. The applet blurs the effect by adjusting the pieces ever so little. In an "honest" version of the applet the effect is clearly noticeable. It becomes obvious there how small an adjustment is really required.