I was listening to the news when Helen came in. She said she was glad I’d spent the evening with Lewis, that I should try to get to know him better and that, once I got to know him better, I might like him. She said, since she and Marge were such good friends, it was a shame Lewis and I didn’t hit it off.

“Maybe we will,” I said and let it go at that.

The next afternoon, Lewis called me at the office.

“Where’d you get that thing?” he asked.

“Found it,” I said.

“Have any idea what it is?”

“Nope,” I told him cheerfully. “That’s why I gave it to you.”

“It’s powered in some way and it’s meant to measure something. That depression in the side must be a gauge. Colour seems to be used as an indicator. At any rate, the colour line in the depression keeps changing all the time. Not much, but enough so you can say there’s some change.”

“Next thing is to find out what it’s measuring.”

“Joe, do you know where you can get another of them?”

“No, I don’t.”

“It’s this way,” he said. “We’d like to get into this one, to see what makes it tick, but we can’t find any way to open it. We could break into it, probably, but we’re afraid to do that. We might damage it. Or it might explode. If we had another …”

“Sorry, Lewis. I don’t know where to get another.”

He had to let it go at that.

I went home that evening grinning to myself, thinking about Lewis. The guy was fit to be tied. He wouldn’t sleep until he found out what the thing was, now that he’d started on it. It probably would keep him out of my hair for a week or so.

I went into the den. The glasses still were on the desk. I stood there for a moment, looking at them, wondering what was wrong. Then I saw that the lenses had a pinkish shade.

I picked them up, noticing that the lenses had been replaced by the kind in the triangular pair I had found there the night before.