Source:psy.ritsumei.ac.jp
Source: ibarguren.blogspot.com
How many circles can you see in this picture?
Answer is in first comment.
Source: http://www.hemmy.net
Source: asylumeclectica.com
Source: http://www.pixelydixel.com
Source: geeksugar.com
Source: en.wikipedia.org/wiki/Tesseract
Source: nakedgeometry.com
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