An animated mask used in conjunction with non-mask animation to create interesting effects. A spaceship and an alien stay static throughout this beaming sequence. The cyan rectangle is the mask. The mask is turned on, so the alien is showing through the area defined by the cyan mask. A layer (regular, non-masking, and non-masked) contains a rectangle filled with semi- transparent cyan color is placed on top of the mask layer. The overlaying beam is filled with a gradient instead of a solid color.