이상 (Idealism) is a philosophical theory that emphasizes the importance of ideas and consciousness in shaping reality. It posits that the material world is either dependent on or secondary to the mind and its perceptions. Idealists believe that reality is fundamentally mental, and that our understanding of the world is shaped by our thoughts and beliefs. In the context of philosophy, notable figures associated with 이상 include Plato and Immanuel Kant. Plato's theory of forms suggests that non-material abstract forms represent the most accurate reality. Kant, on the other hand, argued that our experiences are shaped by the structures of our mind, highlighting the interplay between perception and reality.