This is Ricard Serra's five plates, two poles

One usually thinks of sculpture as being made of arsty materials and
being off on a pedestal someplace in a dedicated space of its own.

This sculpture is in your space and right on the floor, indeed it
invites you to come right up to it and hang around within its area.

When you do, you realize that not only is it made of hot rolled steel,
but it isn't welded together. It's leaning together in what looks like a delicate balance. And about then you
realize that this sculpture could concievably kill you right where you
stand and your curiosity has placed your life in the hands of the
artist.

Some people say that modern art is really dull and impossible to
understand. I don't get those people.