An artist can use color to indicate depth when a color is very pure and intense than it seems to be

An artist can use color to indicate depth with pure and intense pigment, this gives the illusion of weight and power; color used in sculpture and painting has a different effect on the 2-dimensional and 3-dimensional plains, associated with sparking particular human reactions color has an immense impact on human physiology, sparking emotions.

The answer is a : varying the size of objects or subjects, so that some are smaller than others and the illusion of depth is created.hope this : )

Answer installations;