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How bright are the intersections between the lines? With white circles on them, some appear to have black circles. Remove the circles and some appear to have dark smudges. But in fact all are the same.[more]
Try different sizes and contrasts for the strongest effect.[less]
Contributed by: Jon McLoone (March 2011)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: March 7 2011