Our guide grew impatient with my picture-taking of the Sisters mountains. “You’re not going to get a decent shot — no impression of scale. Maybe if you frame them in a window?”

“A window?”

He led us up over the tumble. After a few hundred yards of hardscrabble, we dropped down into a smooth-floored labyrinth open to the sky. After several turns, we ducked into a shallow cave and found our window.

“This is amazing. I’ve never heard of this,” I said.

“No one has. They made it last week,” he said.

“Who?”

“Just get your picture.”