Did you know that those tiny yellow 20s on the back of a $20 dollar bill are actually arranged in a highly specific pattern?
EURion Constellation
They are placed in a EURion constellation pattern, and they actually have a very interesting anti-counterfeiting purpose.
I was trying to scan in an image of a $20 bill into my computer (for an article I’m working on, I swear!). When I used Adobe Photoshop to do this, I got this error message.
Apparently, computer programs and high resolution copy machines are designed to look for and prohibit the scanning, manipulation and printing of documents that contain the EURion symbol.

The EURion protection measure is also used on the Euro, Yuan, Franc, Yen, Schilling, and many other currencies.
In addition, you can see it on the new $5 bill that is currently being rolled out in the United States.

Crazy huh? You learn something new everyday.
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