Design thinking processes have been studied since the 1970s, exploring the intellectual phenomena that occur while designers practice design. These intellectual phenomena include the formation of intelligence, operation of knowledge, and actions taken for implementing design, which are the cognitive activities explored in the field of psychology. Recently, these cognitive activities that occur in design were recognized as a special cognitive domain with special behaviors, named design cognition. Design cognition focuses on the processes and psychological phenomena of how humans understand, process, formulate, generate, store, retrieve, and recycle design related knowledge that leads to the creation of a design. These design processes and cognitive phenomena are not only different from other thinking domains, but are also unique forces that turn design conceptual schemes into physical artifacts. Behind these psychological activities, forces exist that create certain “recognizable features” in design products. These features are recognized through perception to categorize the product as an individual style. Due to the existence of design styles, outstanding design products can easily be recognized by the public as cultural symbols.