# Excel Optical Illusions Week #30

Wow! Thirty straight weeks of Excel based optical illusions, right here at Excel Hero. Number 30 is called Curry's Paradox Missing Square. It is brought to us by Hui who has contributed several illusions this year.

Hui's original was very creative. I tweaked the animation a little. I think it looks great.

So where does that square come from anyhow?

The workbook has the solution. Here it is.

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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:

And here's a list of other animated charts on Excel Hero:

- Excel, A Presentation Platform (Number Spiral)
- Lilac Chaser (Optical Illusion)
- Stereokinetic (Optical Illusion)
- Illusory Contours (Optical Illusion)
- Breathing Square (Optical Illusion)
- Enigma (Optical Illusion)
- Two Sinusoids (Optical Illusion)
- Perpetual Collisions (Optical Illusion)
- Freezing Rotation (Optical Illusion)
- Reverse Spoke Illusion (Optical Illusion)
- Stepping Feet Radial Illusion (Optical Illusion)
- Swimming Fish (Optical Illusion)
- Mutually Interfering Shapes (Optical Illusion)
- Kaleidoscope Motion (Optical Illusion)

Daniel, Hui,

nice one. Great work again.

But the explanation is pretty obvious: the first object is no triangle. It just looks like one at first sight. However, there is a buckling between the red triangle and the green one. This buckling leads to the missing square in the second object.

As Robert already noted, the two triangles are not similar, just very nearly so. It's interesting how large the sliver of difference turns out to be, though: I wouldn't have expected it to be so large when assembled into a square.

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This page contains a single entry by Daniel Ferry published on September 13, 2010 11:32 AM.

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