Man, those are cool animations! --Dan ---------------------------------------- Erich wrote: << [Rich wrote]:

This suggests an interesting, though difficult, contour plot to make in the 1st quadrant of the plane: F(x,y) = the largest number of diameter-1 circles that can be packed in an x*y rectangle.

i've managed to find all F(x,y) <= 8. you can see them animated here:

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