Contemporary dance emerged in the 1950s as the dance form that is combining the modern dance elements and the classical ballet elements. It can use elements from non-Western dance cultures, such as African dancing with bent knees and large leaps in the air, and Butoh, Japanese contemporary dancing that developed in the 1950s. It is also derived from modern European themes like poetic and everyday elements, broken lines, nonlinear movements, and repetition. Many contemporary dancers are trained daily in classical ballet to keep up with the technicality of the choreography given. These dancers tend to follow ideas of efficient bodily movement, taking up space, and attention to detail. Contemporary dance today includes both concert and commercial dance because of the lines being blurred by pop culture and television shows.