Why do we group artworks with similar characteristics into periods or styles

What is forming a pliable medium, such as clay or paper mache’, into a sculpture?

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 .

During which period did the artists create works using software such as photoshop, without actually programming