From the 1890s until the early 1930s, why were there very few movies in color produced?

This was due to the fact that there wasn’t much inventory in having color contrast in lens for the filming industry. when they began to see that they could use a color sheet and see through a prisma they could see the colors reflect onto the screen as shown from the other end of the lens.

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art.