Much of Karl Stirner's work is considered to embody an abstract style. Stirner used his metalwork and steel sculptures to translate and express many of his inner feelings and thoughts. Stirner's sculptures typically fall into two subcategories of the abstract: expressionism and constructivist. His expressionist sculptures have been described as "anxiety-ridden" while his constructivist sculptures have been described as "depressive". This is because they appear to elicit depressive emotions and feelings of internal conflict. The "dream-like" aspect of his work is supposedly inspired by Stirner's unconscious state.