Compositing is the process of combining at least two images to produce an integrated final result. The process can be as simple as placing text over an image, or as complex as combining live actors with drooling space aliens who shoot laser beams from their eyes. Motion graphics artists use various compositing techniques to create animated visual effects, including changing group and layer order, transforming the physical properties of layers (such as scale), adjusting layer opacity and blend mode settings, applying filters to layers, and creating text and shapes. Motion graphics projects often combine layout and design techniques with special effects such as keying, masking, color correction, and creation of particle systems.