"But," Malone said, "why does it take so long? I'd think it would be fairly easy to spot a robotic or a semirobotic brain capable of controlling a car."
"It might have been, once." Leibowitz said. "But these days the problems are rather special. Oh, I don't mean we can't do it—we can and we will. But with subminiaturization, Mr. Malone, and semipsionic circuits, a pretty good brain can be hidden beneath a coat of paint."
For no reason at all, Malone suddenly thought of Dorothy again. "A coat of paint?" he said in a disturbed tone.
"Certainly," Leibowitz said, and smiled at him. It was a warm smile that had little or nothing to do with the problem they were talking about. But Malone liked it. It made him feel as if Leibowitz liked him, and approved of him. He grinned back.
"But a coat of paint isn't very much," Malone said.
"It doesn't have to be very much," Leibowitz said. "Not these days. I've often told Emily—that's my wife, Mr. Malone—that I could hide a TV
circuit under her lipstick. Not that there would be any use in it—but the techniques are there, Mr. Malone. And if your conjecture is correct, someone is using them."
"Oh," Malone said. "Sure. But you can find the circuits, if they're there?"
Leibowitz nodded slowly. "We can, Mr. Malone," he said. "They betray themselves. A microcircuit need not be more than a few microns thick, you see—as far as the conductors and insulators are concerned, at any rate. But the regulators—transistors and such—have to be as big as a pinhead."
"Enormous, huh?" Malone said.