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@futurebird Years ago, I worked at Kenner and did some of the packaging design for the Sparkle Spirograph. I had to create my own designs on the computer because the actual spirograph art with the glitter didn't reproduce well enough. What I found interesting is that they had their engineers reverse calculate my design to ensure that it could indeed be created using an actual Spirograph. (I did have to change my design slightly; I think I mis-measured the inner diameter & had one loop too many?)