Immanuel Kant
Immanuel Kant (; ; 22 April 1724 – 12 February 1804) was a German philosopher who is a central figure in modern philosophy. In his doctrine of transcendental idealism, he argued that space, time and causation are mere sensibilities; "things-in-themselves" exist, but their nature is unknowable. In his view, the mind shapes and structures experience, with all human experience sharing certain structural features. He drew a parallel to the Copernican revolution in his proposition that worldly objects can be intuited "a priori" ("beforehand"), and that intuition is therefore independent from objective reality. Kant believed that reason is the source of morality, and that aesthetics arise from a faculty of disinterested judgment. Kant's views continue to have a major influence on contemporary philosophy, especially the fields of epistemology, ethics, political theory, and post-modern aesthetics.
Königsberg
Königsberg was the birthplace of the mathematician Christian Goldbach and the writer E.T.A. Hoffmann, as well as the home of the philosopher Immanuel Kant, who lived there virtually all his life and rarely travelled more than ten miles () away from the city. Kant entered the university of Königsberg at age 16 and was appointed to a chair in metaphysics there in 1770 at the age of 46. While working there he published his "Critique of Pure Reason" (arguing that knowledge arises from the application of innate concepts to sensory experience) and his "Metaphysics of Morals" which argues that virtue is acquired by the performance of duty for its own sake. In 1736, the mathematician Leonhard Euler used the arrangement of the city's bridges and islands as the basis for the Seven Bridges of Königsberg Problem, which led to the mathematical branches of topology and graph theory. In the 19th century Königsberg was the birthplace of the influential mathematician David Hilbert.