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this is 99% invisible i'm roman mars in the middle of Sprau Plaza on the campus of UC Berkeley is a sculpture 60,000 feet tall

but don't feel bad if you've never noticed it before.

I've had people, you know, come and look for it specifically and not find it.

That makes me think, well, maybe I should have made it a little bigger.

Or maybe that's just the cost of making an invisible sculpture.

I'm kind of setting myself up, aren't I? That's Mark Bresven Kimpin. His

invisible sculpture is known to most as the free speech monument. It's actually it's called column of earth and air.

It's a six inch circle of soil and the column of air above it extending all the way to the

limit of US-controlled airspace, hence the 60,000 feet.

The column is marked by a six foot granite ring embedded flush into the concrete of the plaza.

The inscription of the outer edge reads,

This soil and the airspace extending above it shall not be part of any nation

and shall not be subject to any entity's jurisdiction.

It's a sculpture that eschews the traditional materials of wood, clay, or metal and instead uses

jurisdiction laws and politics as kind of material to work with.

The free speech monument has both subtlety and grandeur,

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