Space in 2-dimensional work is depicted. The picture plane is the 2-dimensional surface on which the artist works. The four perspective types are Atmospheric, Linear, Planar, and Foreshortening. Found most commonly in landscapes planar - the use of overlapping forms or shapes. Layering implies that something is in front and the other is behind.
Real light is like the light that strikes sculpture.
Blue are the three primaries. All colors come, theoretically, from mixtures of these three colors. Mixtures of the primaries. Blue and Orange, Red and Green, Violet and Yellow. These are also known as the holiday colors.