"We're physical objects, we think of ourselves as these kind of free-floating brains, but the brain is such a little part. It's way smaller than we like to think. We think we're these important human beings. We're not animals or anything. But what did we come out of? What are we made out of? We're made of the same stuff as out there."

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Suppose there were an experience machine that would give you any experience you desired. Superduper neuropsychologists could stimulate your brain so that you would think and feel you were writing a great novel, or making a friend, or reading an interesting book. All the time you would be floating in a tank, with electrodes attached to your brain. Should you plug into this machine for life, preprogramming your life experiences?...Of course, while in the tank you won't know that you're there; you'll think that it's all actually happening...Would you plug in?

— Robert Nozick