Cub Driver wrote:

For one thing, it was designed to be graffito-proof.

Exactly. The Atlanta system copied some of the features. Floors are tile and can
be cleaned with caustic chemicals to remove paint. Walls and ceilings are either
concrete or aluminum with a baked-on coating. Just about any type of readily
available paint can be removed from either with strippers that won't harm the
coating on the aluminum. Stuff that won't come off the concrete is just painted
over with concrete-colored paint.

Of course, some people have discovered that you can carve slogans and such into
the aluminum. In Atlanta, perpetrators are likely to require a short detour to
Grady (the trauma hospital) en route to the jail if they are caught.

George Patterson
Why do men's hearts beat faster, knees get weak, throats become dry,
and they think irrationally when a woman wears leather clothing?
Because she smells like a new truck.