This is a good visual explanation from nostr:npub1l0ans4w4psmcv6hsqjz2v3mxszhputlsfn4emkynv3jlwrfez59s35q0ug.
nostr:note1592d4rcxr5fdhkzemm2q8rhuqw6m0lqr07wm4et0zxk5md770n6qqunmtx