In dance, choreography is the act of designing dance. Choreography may also refer to the design itself, which is sometimes expressed by means of dance notation. A choreographer is one who creates dances. Dance choreography is sometimes called dance composition. The art of choreography involves the specification of human movement and form in terms of space, shape, time and energy, typically within an emotional or non-literal context. Movement language is taken from the dance techniques of ballet, contemporary dance, jazz dance, hip hop dance, folk dance, techno, k pop, religious dance, pedestrian movement, or combinations of these.