"In the end nobody knows how it's done — how art is made. It can't be explained. Optical devices are just tools. Understanding a tool doesn't explain the magic of creation. Nothing can."

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It win be a device that will permit communication without any time interval between two points in space. The device will not transmit messages, of course; simultaneity is identity. But to our perceptions, that simultaneity will function as a transmission, a sending. So we will be able to use it to talk between worlds, without the long waiting for the message to go and the reply to return that electromagnetic impulses require. It is really a very simple matter. Like a kind of telephone.

— Ursula K. Le Guin