This weeks' Excel Optical Illusion is called, Enigma
When staring at the sun in the center, you should quickly see some strange and scintillating activity in the purple circles. If you stare long enough you may even see a supernova!
The Enigma optical illusion is subtle, the supernova, not so much. Ok. I added the animation with VBA. I was staring at the Enigma, and I could not resist.
The chart is really two Radar charts stacked on top of each other. The bottom one graphs the the black and white rays. The top one is responsible for the circles. Pretty basic stuff, but the effect is quite good in my opinion.
This one requires Excel 2007 or greater. Sorry, but the earlier versions weren't up to it. It's funny. The workbook is only 26 KB, while the animated GIF above is over 6 MB! There's some data compression for you. And, the animation in the workbook is quite a bit smoother than the GIF.
Here's the workbook.
--- UPDATE ---
I just looked at this blog entry with Internet Explorer 8. Wow. The animated GIF sucks. In Chrome and Firefox, it is not half bad. Just download the Excel 2007 file. The animation is way better than all of the browser rendered GIF files.
Here's a list of other animated charts on Excel Hero:
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