Leonardo da Vinci is well known for his creative works.
Creativity is a mental and social process involving the discovery of new ideas or concepts, or new associations of the creative mind between existing ideas or concepts. Creativity is fueled by the process of either conscious or unconscious insight. An alternative conception of creativeness (based on its etymology) is that it is simply the act of making something new.
From a scientific point of view, the products of creative thought (sometimes referred to as divergent thought) are usually considered to have both originality and appropriateness.
(http://en.wikipedia.org/wiki/Creativity)
