Humans are not magically creative as much as they'd like to be.
If i ask you to think of a random number, you don't just pull it out of thin air, It can be based on tens to hundres of things: -Should i do a relaly low or high number? -People always use round numbers that end in 0 or 5, maybe i shouldn't do that, or should i to make it seem truer -what other large "random" numbers have a heard? -i remember seeing a number recently, maybe try a modification of that -you used {x} as a random number last time, go similar to that?
All this adds up in that under a second thought you have when i asked you to think of a random number. the literal same thing goes into all creative works, the output is a function of the input.