What Do You Mean, "Future Computer"?

The vision of a personal, intelligent, navigable knowledge machine has been circulating between literature, research labs, film sets, and tangible products for almost a century, each expression within a medium reinforcing others.

You know it when you see it. The concept is so ingrained and ubiquitous in the culture that when they show you one they don't even have to explain what it is or how it works; you already know what it does.