The direction of the modernist architecture based on the premise that architecture should be modeled in analogy to nature. It is characterized by fluid and plastic forming molds, sometimes modeled on living organisms. Organic architecture evolved from the early twentieth century, especially in the 20s and had its big boom in the 50s and 60
The author of the thesis of the analogy between architecture and nature has been operating in the first mid-nineteenth century American sculptor Horatio Greenough. He called for a departure from the straitjacket of historicism and natural shaping without binding patterns. Among the prominent architects of this topic has an analogy in Louis Sullivan, who believed that the formation of architecture is not about naddawaniu form, but the tracing. In 1896 in his book The tall office building (literally high office), wrote that life is characterized by the fact that it takes the form of the functions and the essential nature of each problem is that it contains a solution and tells them.
While functionalist modernism currents used the analogy of nature only in the ontological sense, the founder of organic architecture to imitate nature quite literally, taking care not infrequently, that architecture should become a part of nature. Hugo Häring wrote that in order to find the shape, rather than to a rigid form, we will be in harmony with nature. Proponents of organic architecture have argued that modernist architecture, as directed to human needs and based on scientific understanding of the world, must flow from the vital currents of nature, and not be on the line is drawing. Also criticized as unnatural and unnecessary stylization cubic shapes of buildings, especially if their external form przyjmowała different shape than the spatial function. Their works thus taking over the complicated shapes, but drawn from actual functional and spatial dependence. Hence, the terms are sometimes used functionalism organic or organic modernism.