Here's another take on the Eye Jitter illusion.
Does the central large square with the little squares inside float and dance above the background of circles?
Sometime shaking your screen a little enhances the illusion. Seriously!
This was fairly straightforward from the Excel charting perspective. The large square is constructed from error bars. The little squares and the circles are markers on an XY (Scatter) chart. This week's file is an .xls so it should work for everyone, but for some reason the circles look terrible in versions prior to Excel 2007, and the illusion suffers as a result.
I'll have another next week - and it's completely different than all the previous illusions...
Here's the workbook:
--- UPDATE ---
After Lori's fine work I decided to upload a new workbook that shows the named formula approach alluded to in the discussion below. The workbook contains two charts. The first uses Lori's formulas. The second chart uses my suggestions. Neither is more correct, but it should be instructive looking at both. To do so, you will need to use the Name Manager. The charts are not formatted, so the optical illusion is not there. The Named Formula discussion is simply about preparing the data for the chart, and not the formatting that produces the illusion. Here's the workbook:
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