The idea of accessible, mass-produced design that is affordable to anyone was not only applied to industrial mechanics, but also to the aesthetics of architecture and furniture. This philosophy of practicality came to be called Functionalism. It became a popular "catchword" and played a large role in theories of modern design. Functionalism rejected the imitation of stylistic and historical forms, and sought an establishment of functionality in a piece. Functionalist designers would consider the interaction of the design with its user and how any of the features, such as shape, color, and size, would conform to the human posture.