Stare at Figure 8-1 for a minute. Do you see anything other than random dots? Figure 8-1 is an autostereogram, a two-dimensional image that creates the illusion of three dimensions. Autostereograms usually consist of repeating patterns that resolve into three dimensions on closer inspection. If you can’t see any sort of image, don’t worry; it took me a while and a bit of experimentation before I could. (If you aren’t having any luck with the version printed in this book, try the color version here: https://github.com/electronut/pp/images/. The footnote to the caption reveals what you should see.)

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