Living in a world that is valued only as gain, an ever-expanding world-as-frontier that has no worth of its own, no fullness of its own, you live in danger of losing your own worth to yourself. That's when you begin to listen to the voices from the other side, and to ask questions of failure and the dark.
Ursula K. Le GuinIt 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