"Suppose there was an experience machine that would give you any experience you desired. Super-duper 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, “Anarchy, State, Utopia”

"Suppose there was an experience machine that would give you any experience you desired. Super-duper 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, “Anarchy, State, Utopia”