The boundaries, like defenses, drew lines that were hard and uncompromising. They, too, were man-made, abstractions dominating reality. When you cros… - George R. Stewart

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The boundaries, like defenses, drew lines that were hard and uncompromising. They, too, were man-made, abstractions dominating reality. When you crossed by the highway, on a line, the road surface changed. It was smooth in Delaware, but when you went into Maryland, you felt a change in vibration, and all at once the tires hummed differently. “State line,” the sign read. “Entering Nebraska. Speed limit 60 m.p.h.” So even right and wrong altered with the sharp snap of a discontinuity, and you stepped harder on the throttle.
At the national boundary the flags showed different colors, though the same breeze blew them. You stopped for customs and immigration, and were suddenly a stranger, unfamiliar. “Look,” you said, “that policeman has a different uniform!” You got new money, and even for picture postcards the stamps had to have another face on them. “Better drive extra carefully,” you said. “Wouldn’t be good to get arrested over here.” That was a funny business! You stepped across a line you couldn’t see, and then you were one of those queer people—a foreigner!
But boundaries fade even faster than fences. Imaginary lines need no rust to efface them.