"Because I'm human! That's the most basic robot command."
"I don't know," the Eldest said, eying Dodeth shrewdly. "You might not be a human. You might be a snith. You look like a snith."
Dodeth swallowed the insult, wondering what the Eldest meant.
"Arvam," the Eldest Keeper said to the robot, "doesn't he look like a snith to you?"
"Yes, sir," Arvam agreed.
Dodeth swallowed that one, too.
"Then how do you know he isn't a snith, Arvam?"
"Because he behaves like a human, sir. A snith does not behave like a human."
"And if something does behave like a human, what then?"
"Anything that behaves like a human is human, sir."