Although creativity is considered a rare personality attribute, found only in gifted individuals, worthwhile innovations are often produced by 'ordinary' people. Thought is a philosophical method used for the analysis of concepts (most notably the concept of personal identity). It works by testing our intuitions in an imagined situation. Thought experiments are also used in the natural sciences: Isaac Newton used them when considering the nature of light, and Albert Einstein relied on them for the development of his theories of relativity. Ideology is a form of social or political philosophy in which practical elements are as prominent as theoretical ones. It is a system of ideas that aspires both to explain the world and to change it. A distinction is often drawn between the ideological and the pragmatic approach to politics, the latter being understood as the approach that treats particular issues and problems purely on their merits and does not attempt to apply