Dancing lights.

Bokeh - (derived from Japanese word "boke", meaning 'blur') - In photography, refers to the creative use of lens blur as a composition technique. The aim of bokeh is to deliberately blur the background or foreground (or both) in order to draw the viewer's attention to a particular area of the photo. One method of achieving Bokeh involves using a lens with a wide aperture setting, which in turn produces a narrow depth-of-field. It should be noted that some lenses tend to be more suited than others for achieving such an effect. Central to achieving effective bokeh is an understanding of the concept of depth-of-field (dof).