Effects created on the set during production, which generally do not require further image manipulation. Special effects include pyrotechnics, animatronic creatures and make-up effects. Pyrotechnics is the controlled use of incendiary materials to create explosions, fires, and smoke. Animatronics is simulating human, animal, or creature forms, controlled manually or remotely. Make-up effects involve changing an actor's physical appearance, using conventional make-up or the addition of artificial parts.