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| Kanizsa's Triangle |
There are several 'right' answers to this question, I think, but I'm most interested in the illusion of a white triangle pointed down at the center of the lines and circles. There isn't really a white triangle in this image, nor is there a secret magen david, a star of David. Instead the empty space is marked out through lines and sectors of circles such that your brain fills in the triangle.
Empty space is given structure and the illusion of form through its surrounding objects.
In this week's torah reading of Vayakhel, we see how the sacred space of the tabernacle is structured with wood, gold and cloth to create a form for the divine. Specifically, once we get to the holiest centre of the holiest space, we find the Ark of the Covenant, above which are two unusual figures (Ex 37):
