Idealism is philosophy on a grand scale, combining micro and macroscopic problems into systematic accounts of everything from the nature of the universe to the particulars of human feeling. In consequence, it offers perspectives on everything from the natural to the social sciences, from ecology to critical theory. Heavily criticised by the dominant philosophies of the 20th Century, Idealism is now being reconsidered as a rich and untapped resource for contemporary philosophical arguments and concepts. This volume provides a comprehensive portrait of the major arguments and philosophers in the Idealist tradition. The book demonstrates how Idealist philosophy provides a fruitful way of understanding contemporary issues in metaphysics, the philosophy of science, political philosophy, scientific theory and critical social theory.