Jon Rogeson and I saw each other at the same time, and I did not like the expression in his eye as he crooked a finger at me. I went over to his table. He was pleasant looking, as Builders go, with blue eyes less dull than most, and a brown, unruly topknot of hair such as is universally affected by them.

“Sit down,” he invited, revealing his white incisors in greeting.

I never sit, but this time I did so, to be polite. I was wary; ready for anything. I knew that there was something unpleasant in the air. I wondered if he had seen me passing the Moon Glow to Benny somehow. Perhaps he had barrier-penetrating vision, like the Z group of metal people … but I had never heard of a Builder like that. I knew that he had long suspected that I made Moon Glow.

“What do you want?” I asked cautiously.

“Come on now,” he said, “loosen up! Limber those stainless steel hinges of yours and be friendly.”

That made me feel good. Actually, I am somewhat pitted with rust, but he never seems to notice, for he is like that. I felt young, as if I had partaken of my own product.

“The fact is, B-12,” he said, “I want you to do me a favor, old pal.”

“And what is that?”

“Perhaps you have heard that there is some big brass from Earth visiting Phobos this week.”

“I have heard nothing,” I said. It is often helpful to appear ignorant when questioned by the Builders, for they believe us to be incapable of misrepresenting the truth. The fact is, though it is an acquired trait, and not built into us, we General Purposes can lie as well as anyone.

“Well, there is. A Federation Senator, no less. Simon F. Langley. It’s my job to keep them entertained; that’s where you come in.”

I was mystified. I had never heard of this Langley, but I know what entertainment is. I had a mental image of myself singing or dancing before the Senator’s party. But I can not sing very well, for three of my voice reeds are broken and have never been replaced, and lateral motion, for me, is almost impossible these days. “I do not know what you mean,” I said. “There is J-66. He was once an Entertainment—”

“No, no!” he interrupted, “you don’t get it. What the Senator wants is a guide. They’re making a survey of the Dumps, though I’ll be 

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