I was taking a stroll through the park with my friend the space alien. It's only his second visit to Earth, and the first time he's really had a chance to get away from the diplomatic meetings and trade shows, so I suggested a little nature walk and he was up for it. We spent most of the time swapping the names of plants, ours and the ones from his planet that looked most like the Earth
We were crossing a bridge in the center of the park when he looked up at the sky and froze, transfixed by the sight of something. I followed his stare, but all I saw was clouds.
"Don't you have clouds on your planet?" I asked him.
"Oh, sure," he replied (his grasp of informal speech is getting good). "We have all sorts of clouds. Big and billowy, pale and wispy, the whole gamut, or so I thought. But I was wrong."
"How so?" I asked.
"Well," he said, turning to me and pointing. "These clouds . . . I can see pictures in them!"