There are also cels that have computer-generated special effects. The artist would take a normal cel and then add a solid black sections/layers for the locations that they wanted to add the effects. The image on the lower left shows the cel with its multiple black layers showing. The lower right image is a screencapture showing two types of computer-generated effects. The first is the bright glow accenting the Lord of Nightmares’s body. The second is the lightning flashing across the green background.