This happened as a result of conceptual blending, which mainly take places in the subconscious and appears quiet simple at surface or conscious level. It is an intricate network of conceptual ideas producing cognitive ones. The process starts with a mental space where thought and consequent action take place. Different types of mental spaces, containing different type of thoughts, form a network. Different types of networks, then goes on to form a conceptual integration network. This integrated or blended mental space receives thoughts or inputs from other networks, inputs that aren't present within the network itself. However, this isn't a random process but take place under certain principles that control and supervise the entire process of connecting and receiving inputs from other networks. This theory applies to almost all fields of science and art. ( Turner and Faucoinner)
George Lakoff is also a linguistic expert presently teaching at University of California at Berkeley. Though most of his work is linguistically in nature, he is famous for his work that focuses on metaphor and its importance to human thinking, political rhetoric and society at large. He has also introduced the idea of "embodied mind".
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