Italian Renaissance architect who used the camera obscura to further develop ideas about using perspective 

Art is a visual language.

the amount of space occupied  by an object

the lightness or darkness of a plane or area

in the system of perspective, the lines that all meet at this:

means symbolism, or writing with images, and the meaning or interpretation of a work of art

Style is a characteristic way in which an artist or group of artists uses visual language to give a work an identifiable expression

In China, calligraphy was once considered to be a very high art form.

sculpture can be either three dimensional in the round or in relief

if a sculpture can be viewed from all four sides then it is a relief.