Common special effects included aiming the camera into a monitor that said camera is connected to - a technique called "video feedback." The original video and the newly captured pictures from the monitor were combined with a video switcher to create an "infinity" effect as same video repeated itself in a seemingly endless visual loop. Changes in position or angle of the cameras were used to create trails of light which seemed to spill off dancers in a manner interpreted by many as "psychedelic." Producers felt the distorted video of moving bodies, often seeming to float in space, and moving "in tune" to pop songs, created enhanced enjoyment for viewers.