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The caustic appearing on the surface of this cup of coffee is a cardioid.
The caustic appearing on the surface of this cup of coffee is a cardioid.
Boundary of the central, period 1, region of the Mandelbrot set is a precise cardioid.
Boundary of the central, period 1, region of the Mandelbrot set is a precise cardioid.
Cardioid formed by light on a watch dial.
Cardioid formed by light on a watch dial.
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An ordinary cusp occurring as the caustic of light rays in the bottom of a teacup.
An ordinary cusp occurring as the caustic of light rays in the bottom of a teacup.