Kefrens was a highly influential Danish demogroup active on the Amiga scene from the late 1980s through the early 1990s, best known for their legendary "Bouncing Ball" demo that demonstrated advanced raster-bar effects and smooth sprite animation. Based in Denmark, they became one of the most respected groups in the European demoscene, consistently pushing technical boundaries with limited hardware resources. Their productions set new standards for visual effects and remain iconic examples of the creative programming possible on the original Amiga chipset.