Before the period of Renaissance, paintings hardly showed the concept of three-dimension give people a one flat plane feeling with several squeezed layers. There was no depth. Looking back, some of us would probably hardly be convinced that people before did not have the idea of the "space". They saw what was in front of their eyes, they painted it down simply being faithful to their eyes. The idea of three-dimensional space itself has been gradually evolved for thousands of years, men do not have it congenitally. There was no solid feeling therefore people didn't have a great emphasis on the light and shadow which are two essential elements forming gradation, creating the "space."
There are many different example of light.
My favorite example occurs when lighting is used in photography because one different angle of light can create a seperate picture that another angle, even if they are a picture of the same object.
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