Excel Optical Illusions #12

The illusion of expanding movement works best for me when I'm not looking at it directly, and when my eyes are moving, for example when I read the menus at the top of this window.

As in the Hering Illusion a few weeks ago, this is not a chart. The illusion is constructed from inserted star shapes on a workbook. But when it's at its full size in the workbook, this illusion is particularly strong, at least for me.

Here's the workbook:

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