Triplerot AMIGA Demo by deft / TAS (The Assassins) in 1989

The twisted logo effects with transparency at the top and bottom of this OCS (original chipset) AMIGA demo do only use the Copper, no CPU or Blitter, and are realtime "calculated". In fact, only one bitplane is moved up (and down in the background), colors are set per line including overlapping planes, movement is done via bitplane start-offsets.