I think the human subconcious mind is capable of levels of pattern-matching and intuitions that manifest as vision: aka something you "know" but can't necessarily explain.

Visions aren't always correct, but they're enhanced by immersing yourself in the relevant context and data to provide your subconscious mind ample time and information to make those connections to generate those "Aha" moments called inspiration.

Richard Feynman described in one of his books the best way to appear like a genius is to always be actively learning at least 3 new unrelated topics, and you will glean patterns and details from everywhere to constantly increase you understanding of these topics, leading to inspiration.