This is intended as a very abstract philosophical question.
Like Einstein with relativity was inspired by a man falling from a roof and a moving train. Most creative ideas seem to boil down to a person moving ideas across domains. Do you think this is always true even if the person is unwilling to admit the root thoughts, or perhaps they are completely unaware of the connections they subconsciously made? Is there truly a provably unique thought or is everything a product of experience?
How does one form thoughts without attaching them to something else in their brain? You can’t have ideas about something without it being in reference to something else, or else you couldn’t possibly understand your own idea.