In ancient Greece, kitchens were equipped with a built-in vacuum system for crumbs. The Greeks understood the importance of cleanliness in the kitchen and developed a system to keep their cooking spaces free of debris. They used sloping floors and strategically placed drains to collect crumbs and other food waste. These drains would lead to a central collection point, where the crumbs could be easily removed. This vacuum system helped to maintain a clean and hygienic kitchen environment, ensuring the safety of the food prepared.