As requested by hammondsben, a circlechart from diameter 1 till 256, both even and odd.
No grid, every block is 1 pixel
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With grid, every block is a 3 pixel square seperated by a 1 pixel line.
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No grid, every block is 1 pixel
[image no longer available]
With grid, every block is a 3 pixel square seperated by a 1 pixel line.
[image no longer available]



I like the discrete patterns of the black and white too!