The 18th century German philosopher Immanuel Kant lived very firmly in a world of time. He was such a stickler for routine that his fellow citizens of Koenigsberg (now Kaliningrad, in Russian territory) could set their watches by his afternoon walk.

However, in his philosophical work, Kant was skeptical about time. He believed that time is created by the human mind, rather than a fundamental quality of the world. Out there beyond our minds, there is no time. It is simply a “category” of our minds that helps us to perceive objects and order our experience.