This field involves creative expression through drawing, sculpting, painting, photography etc. An artist is an especially talented person with the skill to visually express what they see and feel with accuracy, character, and feeling. An artist usually becomes known for one or few techniques, or styles of art. Over time these preferences become an artists' "signature", for which they become known. Independent artists create a market for their work over time. They prefer working independently without restrictions with regard to what they produce. In this way they express their thoughts freely in the art form of their choice, irrespective of the consumer. Commercial artists, on the other hand, work in a structured environment where they apply their artistic ability on request of a client in order to create or enhance a product directed at a specific consumer market. Commercial artists are able to channel their artistic ability into a commercial, saleable skill from which they earn a living.