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 reverse of the Great Seal of the United States as seen on the US dollar note. Money, finance and currency themed design. It features a pyramid of

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Us dollar bill hi-res stock photography and images - Alamy

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

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

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