If one would like to explore these ideas further in a very entertaining way then I would suggest <i>Gödel, Escher, Bach</i> by Douglas Hofstadter <a href="https://en.wikipedia.org/wiki/G%C3%B6del,_Escher,_Bach" rel="nofollow">https://en.wikipedia.org/wiki/G%C3%B6del,_Escher,_Bach</a>