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Topic: Hermann grid variation
Message: Posted by: federico luduena (Apr 25, 2018 07:29AM)
I hadn't see this before. Really powerful. It works well on screen, but incredibly well printed on paper.

https://qz.com/779421/how-to-see-all-the-dots-in-the-12-dot-optical-illusion/
Message: Posted by: Jonathan Townsend (Oct 17, 2018 09:53AM)
That would make a fun card design :)