What's with the floating-eye pyramid on the U.S. dollar bill?

Spoiler: It's not a symbol for the Illuminati. We think.

The Growing Power of Conspiracy Theories, The Brian Lehrer Show

What The Eye In Every Conspiracy Theory Actually Means

Fold a $1 Dollar Pyramid! by Jeremy Shafer

History

Hidden Secrets of the Dollar Bill

Pyramid Dollar Bill

Dollar Sign Pyramid Third Eye Money Sweat Shorts - Athletic apparel

Is the “eye in the pyramid” a Masonic symbol?

What's with the floating-eye pyramid on the U.S. dollar bill?