While putting away the bowls, I noticed some nice limaçons and cardioids made from the refraction of light.

Video of the changing shape – Limaçons

For more info:

• http://mathworld.wolfram.com/Cardioid.html
• http://en.wikipedia.org/wiki/Cardioid
• http://en.wikipedia.org/wiki/Caustic_(optics)
• http://mathworld.wolfram.com/Limacon.html
• http://en.wikipedia.org/wiki/Limacon

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