Canadian archeologist Genevieve von Petzinger is interested in the geometric signs — abstract symbols such as spirals, asterisks and hands — found with remarkable consistency in caves across Europe.
A Geometric Zig Zag Lines of 3D Effect Vector Optical Illusion is a fascinating visual puzzle that hides a 3D image within a 2D pattern. At first glance, it appears to be a random collection of ...
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