Culture refers to organized systems of symbols, ideas, explanations, beliefs and material production that humans create and manipulate in the course of their daily lives. Culture includes the customs by which humans organize their physical world and maintain their social structure. More recent approaches to culture recognize that cultures are not static, homogenous or bounded but dynamic and fluid. Culture refers to the shared social construction of meanings, but simultaneously culture is often also a site of contested meanings. These recent formulations of the concept recognize that culture may be the subject of disagreement and conflict within and among societies, and this disagreement may include the definition of culture itself.