Will Le
UniThread Chromatics: When each thread circle is color coded with hue, the interunion turns out to be the color blending operation at the eye (incidence between the threads). Here I demonstrate the quadratic form of ab, where the result is an epicycloid for temporal interunion and a hypocycloid for spatial interunion. Note that when a < b, the temporal interunion produces a special kind of epicycloid called "peritrochoid". For higher order forms, see the applet Interunion-Euclidean.