I wondered about that, and did notice the grass looked freshly cut. They must run a sprayer to wash off the walkway after they cut the grass.

I've never had the urge to spray paint on public property, but I have seen some amazing examples of graffiti art when I lived in LA.

I think the person who commented on "Art" was being much too generous. There ain't much artistic going on there.
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"You want to go where?"