You are offered a choice between two experience machines.
Machine A is just like the ones you already know about. You'll be on the experience machine until you are 120 years old, getting lots of various sorts of pleasure.
Machine B offers exactly the same experiences as Machine A. However, the experiences are crammed into a much shorter period of time: just one day. The first 12 hours of this day seem to last 12 hours. The next 6 hours seem to last 12 hours. The next 3 hours seem to last 12 hours. And so on (as in Sorensen's "The Cheated God"). A fraction of a second before the 24 hours are up, the machine kills you painlessly. At that time it seems to you as if you have lived 120 highly pleasant years.
Which machine should you choose?
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