This is based on the well-known tessellation of squares and regular octagons, but with each line segment replaced by two semicircles.
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RobertLovesPi.net 
fascinating technique—-
thank you for the explanation
On Wed, Nov 27, 2019 at 9:28 AM RobertLovesPi.net wrote:
> RobertLovesPi posted: ” This is based on the well-known tessellation of > squares and regular octagons, but with each straight segment replaced by > two semicircles. ” >
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