Explore the intricacies of infinite spacetime volume limits in this thought-provoking lecture by Kiwoon Choi at the Galileo Galilei Institute. Delve into the consequences of varying the order of these limits, examining their profound implications for our understanding of spacetime physics. Over the course of 1 hour and 25 minutes, gain insights into advanced concepts in theoretical physics and cosmology, challenging conventional perspectives on the nature of the universe.