You’re right, it can’t. The algorithms are based on something that changes. This is called the seed. Usually the computer’s time clock. This is psuedo-random. Usually random enough. The algorithms have problems. If you run it enough times, you can find patterns in the results.
Back in the stone age, I learned to code on a device that did not have a clock(or I didn’t know about it). You had to provide the number, so the “random” program showed the same set of “random” images in sequence. Now, I know I could have used a text file and kept track of a number to make it change.
To make it MORE random, you use something that has no discernable pattern. Someone mentioned a snapshot of atmospheric data or a lava lamp wall. Using quantum particles is as random as you can get, though.
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