Grids of Lines
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Fill in with more lines, or make the lines thicker. Notice sometimes the illusion of white dots where the lines cross.
Contributed by: Christopher Wolfram (March 2011)
Open content licensed under CC BY-NC-SA
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"Grids of Lines"
http://demonstrations.wolfram.com/GridsOfLines/
Wolfram Demonstrations Project
Published: March 7 2011