JSON Logo

There's a great talk by Douglas Crockford about the saga of JSON— its discovery rather than invention, its curious licensing (to be used for good, not evil, except by IBM, who and its minions may use it for evil), and its logo (intended as an optical illusion, but turns out to be physically plausible).

This is the logo, physically realized. It's a pretty simple geometrical shape made with OpenJSCAD (source code here).