What is it called when you draw intersecting diagonal lines in order to create lights and darks in an artwork?

For plato complete the following paragraph with the appropriate principle of animation? a character is walking down the road and, as he does, he lifts his hat to greet a passerby. this scene uses to make the character relatable. as the character walks, his coat-tails swing left to right with each step. the movement of his coat-tails demonstrates the principle of .