"The philosophers of the Middle Ages demonstrated both that the Earth did not exist and also that it was flat. Today they are still arguing about whether the world exists, but they no longer dispute about whether it is flat"

This quote by Vilhjalmur Stefansson is a funny way of explaining how far we have actually been available in regards to our understanding of the world. In the Middle Ages, thinkers argued that the Earth did not exist which it was flat. This was an extensively accepted belief at the time, in spite of the reality that it was incorrect. Today, we understand that the Earth does exist and that it is round. Nevertheless, despite this development, theorists are still disputing whether the world exists. This is a testament to the complexity of deep space and the difficulty of understanding it. It also functions as a tip that we need to always be open to new ideas and be willing to challenge our presumptions.