Generate seed while runtime

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maybe randomSeed();

but be careful because:

randomSeed(5);
randomSeed((int)random(10));
println(random(100));

it always returns 73.0699 for me. It can be useful if you use it correctly, but still be aware of this. If you want to exit this loop of constant random values, just use something like:
randomSeed(millis()); or frame count, mouseX, day(), second(), hour(), or a sombination of them all.