The bright colors of the double image seemed the only real thing in the darkened room. Even blurred as they were, he could see that the action was subtly different, the shapes subtly not right.

He was looking at aliens.

The impression was of two humans disguised, humans moving oddly, half-dancing, half-crippled. Carefully, afraid the images would go away, he reached up to his breast pocket, took out his polarized glasses, rotated one lens at right angles to the other and put them on.

Immediately, the two beings came into sharp focus, real and solid, and the screen became a wide, illusively near window through which he watched them.

They were conversing with each other in a gray-walled room, discussing something with restrained excitement. The large man in the green tunic closed his purple eyes for an instant at something the other said, and grimaced, making a motion with his fingers as if shoving something away from him.

Mellerdrammer.

The second, smaller, with yellowish-green eyes, stepped closer, talking more rapidly in a lower voice. The first stood very still, not trying to interrupt.

Obviously, the proposal was some advantageous treachery, and he wanted to be persuaded. The Times groped for a chair and sat down.

Perhaps gesture is universal; desire and aversion, a leaning forward or a leaning back, tension, relaxation. Perhaps these actors were masters. The scenes changed, a corridor, a parklike place in what he began to realize was a spaceship, a lecture room. There were others talking and working, speaking to the man in the green tunic, and never was it unclear what was happening or how they felt.

They talked a flowing language with many short vowels and shifts of pitch, and they gestured in the heat of talk, their hands moving with an odd lagging difference of motion, not slow, but somehow drifting.

He ignored the language, but after a time the difference in motion began to arouse his interest. Something in the way they walked....

With an effort he pulled his mind from the plot and forced his attention to the physical difference. Brown hair in short silky crew cuts, varied eye colors, the colors showing clearly because their irises were very large, their round eyes set very widely apart in tapering light-brown faces. Their necks and shoulders were thick in a way that 

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