Ever Wondered How Those Computer-Controlled Christmas Light Displays Work?

I just don't have the time or patience at this point. Maybe after retirement when I don't have anything else going on. It's cool though.
 
I think this is a typo:

"The only difference is that holiday lights have a waterproof coating..."

Aren't "Pixels" waterproof as well? How does one waterproof all those "Pixels" is they aren't made for outdoor use?
 
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