gateway n.

It is a gateway to your world, a means of contact with your plane of existence for those many vicious hordes that dwell in other planes of the fifth dimension.

It could have been four huge fingers…with the palm descending to grasp the daring tri-dimensional ‘Flatlander’ who had the audacity to match wits with a creature from a superior world…. But sometimes I am tempted to organize another expedition to the Maratan Plateau, myself. Try to learn the truth concerning the thing from beyond the Gateway.

The crystals hung in a wide circle, tilting slightly inward. They pulsed with a blackness that was beyond mere dark, a negative thing as blazing and tangible as sunlight. The angle of tilt and the tuning of the facets against one another made the difference in the result, whether projecting the Veil, or motive power, or hypnosis, or serving as a gateway to another time and space.

The progressive civilization of the Superiors had been interrupted by alien creatures, the Luvans, who had opened a Gateway from another world.

He shrugged his wings together and stooped to enter the gateway of the new world. Behind them the old man watched in silence, seeing the work of his lifetime ending. The gulf between them was too broad for leaping. He was human and they were not. Across a vast distance, vaster than the gulf between worlds, he saw the family of the mutations step over their threshold and vanish forever.

I discovered in my time a sort of gateway to your time, and to seventeen other nearly synchronous moments, set up by a scientist unknown to me. Each of the gates seems to open upon one single specific instant. For instance: before I fell into the one which brought me here, I saw a figure I'm sure was yours. And it was motionless above the city, all the time that I was watching it.

Sleek white passenger expresses flashed past pulling dozens of carriages; multiworld commuters, whose route would take them through twenty or more planets as they rushed from gateway to gateway on a never-ending circuit.