In a couple of days I will be starting a new series of high precision engineering charts, starting with the publication of the compelling Smith Chart
In the meantime, this week's Excel Optical Illusion is called the Café Wall Illusion
Are the tiles and horizontal lines parallel?
The Excel version of this illusion was crafted by Excel Hero reader, Hui. Another fantastic job, Hui. I also received a version of the Café Wall from Tim McCollough, but I've lost it. Tim if you send it to me again, I'll post it here!
Hui's version is a 100% Stacked Bar chart. Very cool. It's a dynamic chart with a slider control that allows you to adjust the tiles. When they are aligned vertically, the illusion disappears completely.
Here is the file.
--- UPDATE ---
Tim McCollough was kind enough to resend his version of the Café Wall Illusion - also a very fine implementation.
Here is Tim's file:
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Why do I share these optical illusions? The techniques that are used to make them, when mastered, can be used in many other Excel projects, in charting, formula crafting, and formatting. Learn them. They will aid you on your journey to become an Excel Hero.
Here is a list of other Excel Optical Illusions here at Excel Hero:
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