3 ms·
Possibly this: https://secure.wikimedia.org/wikipedia/en/wiki/G%C3%B6del,_Escher,_Bach https://secure.wikimedia.org/wikipedia/en/wiki/G%C3%B6del,_E... (That is
by shabble 15y ago
Possibly this: https://secure.wikimedia.org/wikipedia/en/wiki/G%C3%B6del,_Escher,_Bach https://secure.wikimedia.org/wikipedia/en/wiki/G%C3%B6del,_E...
(That is, the book "Gödel, Escher, Bach: An Eternal Golden Braid" by Douglas Hofstadter)