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The illusion is caused by the pink and white stars. The attached workbook has check boxes that let you remove either of these and the illusion vanishes. Very interesting how such a strong illusion comes from such a simple chart.
The point of the optical illusions series is to open our eyes with the goal of making better charts. Am I succeeding in your opinion?
I'll have another next Friday?
Here's the chart:
More Optical Illusions
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Blog looks really good mate, keep it up! Inspires me to keep building a following of my own.