Rationalist Architecture is a design philosophy that emphasizes logic, functionality, and clarity in building forms. It emerged in the early 20th century, particularly in Europe, as a response to the ornate styles of the past. Rationalist architects focus on the use of modern materials and construction techniques, prioritizing the needs of the user and the environment. Key figures in Rationalist Architecture include Le Corbusier and Louis Kahn, who advocated for designs that reflect structural integrity and simplicity. This approach often features geometric shapes, open spaces, and a lack of unnecessary decoration, aiming to create harmonious and efficient living environments.