The human brain has the overall processing equivalent of 60
* 86 billion bits per second, or 480 gigahertz. Its storage used is a few gigabytes,
let’s say 10. Its RAM, working memory, less than a terabyte, especially if you simplify what is being processed, or only simulate in the brains what they notice, only having to live up to their limited detection of realism and you could condense it even further by making brains seem (to them) to have a better resolution/more detail in their simulation, even up to infinite, by controlling their perception and reasoning.
The ability to control these things means you can make their experience as simple, small and brief as you like and make them perceive and reason it to be however you like. Anything else would be wasteful. Its processing could, in the future, be matched by 192 cell-sized cores, with internal RAM and memory. Even if we were to say that we needed 1 terabyte of RAM and the same amount of working memory, all individually the size of a neuron and each of those was 10 micrometers, they could still fit in 140 micrometers cubed, less than six times the width of a neuron. In ten cubic centimeter, there could be over three hundred trillion brains, each with the usable storage, combined power and speed of a human brain, an entire universe in a small box.
You can then make it seem to them and to you, by manipulating your reasoning and perception using technology, and manipulate their reasoning and perception like there are any number of people, the universe has any degree of complexity and any nature and you could such manipulation to make their experiences seem, to them and each other, to reflect a real reality, technological progress and them doing the same thing (with universe made as simple as you want and made to seem more complicated to the brains through perception and reasoning manipulation), without them actually doing the same thing, except for some of them being in control of some others and some of them being in control of some other, etc, until it loops around. Do this and you can have our universe’s past and future.
Furthermore, you could make people perceive spending any amount of time alive and make them incapable of telling the difference. All the suffering could be illusory and their happiness/fulfilled preference could be set to the maximum value (infinity), without them knowing it, so no ethical quandaries are in the way. Maximum form factor and energy requirements: a desktop computer. “Timmy, stop playing with your universe and come down for lunch”, you could imagine. Lunch is probably obsolete by then. The aim here is not creating the universe you think you're living in, its creation a simulation of that universe that seems like the universe you think you're living in, then making you you think you try to distinguish your universe from that from that and think you fail.
The ability to control these things means you can make their experience as simple, small and brief as you like and make them perceive and reason it to be however you like. Anything else would be wasteful. Its processing could, in the future, be matched by 192 cell-sized cores, with internal RAM and memory. Even if we were to say that we needed 1 terabyte of RAM and the same amount of working memory, all individually the size of a neuron and each of those was 10 micrometers, they could still fit in 140 micrometers cubed, less than six times the width of a neuron. In ten cubic centimeter, there could be over three hundred trillion brains, each with the usable storage, combined power and speed of a human brain, an entire universe in a small box.
You can then make it seem to them and to you, by manipulating your reasoning and perception using technology, and manipulate their reasoning and perception like there are any number of people, the universe has any degree of complexity and any nature and you could such manipulation to make their experiences seem, to them and each other, to reflect a real reality, technological progress and them doing the same thing (with universe made as simple as you want and made to seem more complicated to the brains through perception and reasoning manipulation), without them actually doing the same thing, except for some of them being in control of some others and some of them being in control of some other, etc, until it loops around. Do this and you can have our universe’s past and future.
Furthermore, you could make people perceive spending any amount of time alive and make them incapable of telling the difference. All the suffering could be illusory and their happiness/fulfilled preference could be set to the maximum value (infinity), without them knowing it, so no ethical quandaries are in the way. Maximum form factor and energy requirements: a desktop computer. “Timmy, stop playing with your universe and come down for lunch”, you could imagine. Lunch is probably obsolete by then. The aim here is not creating the universe you think you're living in, its creation a simulation of that universe that seems like the universe you think you're living in, then making you you think you try to distinguish your universe from that from that and think you fail.
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