In the Search for Extraterrestrial Intelligence (SETI), scientists need to consider what technologies they should look for, including those used by a more advanced species. This has spawned the idea of Megastructures, which was first proposed in the 1960s by theoretical physicist and mathematician Freeman Dyson (who proposed the Dyson Sphere). Since then, many variations and other possible Megastructures have been proposed, all of which are fascinating and fun to think about!