Photographic printing Puns

My parents visited me last weekend. Short on ideas, we decided to hit up a widely-respected art museum. They had some new exhibitions, some of which were a little outside our personal tastes and expectations.

We walked into a photography exhibit and saw, along one wall, a sheet of green. This sheet of green was a little higher and taller than the average door, and stretched all the way down that bit of wall plus a few feet onto the floor.

"Oh," I said, "a green screen. That's kind of a neat little thing to have here. Sort of an homage to that style of film, I guess?"

Little did I know. In hindsight, I don't know why I expected anything different.

My father and I approached the plaque beside it. There we learned the truth: This was not a green screen. No. No, this was a specially printed photograph.

A photograph... of a green screen.

There we stood, astonished at the audacity of the thing before us. "My God," I said aloud, "This, right here, this is something else. This is just plain genius. Can you imagine getting money for something like this? Why didn't we come up with this? This is gold!"

To which my dad simply responded, "No, son...

... it's green."