Theodor Lipps (; 28 July 1851 – 17 October 1914) was a German philosopher, famed for his theory regarding aesthetics, creating the framework for the concept of Einfühlung (empathy), defined as, "projecting oneself onto the object of perception." This has then led onto opening up a new branch of interdisciplinary research in the overlap between psychology and philosophy. Biography Lipps was one of the most influential German university professors of his time, attracting many students from other countries. Lipps was very concerned with conceptions of art and the aesthetic, focusing much of his philosophy around such issues. Among his fervent admirers was Sigmund Freud. There were at least two theories that made an impact on Freud's works. The first was Lipps' theory of the unconscious mental events. Lipps was then a main supporter of the idea of the Unconscious. The second was Lipps' works on humor. Einfühlung He adopted Robert Vischer's notions of empathy or esthetic sympathy (Einfühlung, literally translated to "feeling-into"). He was responsible for popularizing the term by modifying Vischer's conceptualization. Particularly, Lipps concealed some of the thinker's mysticism, hiding it within the sphere of scientific psychology in his work, Aesthetics of Space and Geometrical Illusions. The term was used to describe the process of contemplating art objects as representation of our feelings. Lipps developed it into an aesthetic theory, which was refined further by other thinkers such as Roger Fry and Vernon Lee. This concept of aesthetic resonance finds parallels throughout aesthetic philosophy. In this concept, empathy is said to begin with both the object and the pleasure drawn together in a single act instead of a separate object with which we have aesthetic enjoyment or with pleasure taken in an object. According to Lipps, empathy incorporates movement or activity, which is bound up with observed object by: 1) being derived from it; and, 2) by being inseparable from it. For his works, he is considered one of the most important representatives of the psychology of aesthetics alongside Stephan Witasek and Johannes Volkelt. Psychologism Lipps was an important adherent of psychologism early in his career. This philosophy was based on the Neo-Kantianism that became influential in German philosophy during the second half of the nineteenth century. He became a spokesman of this school as evidenced in his early publications. In his work, Logik (1893), he declared his "unlimited foundational logical psychologism", which is based on a partial