well, space will figure predominantly in works adessing architecture or sculptu, but they are created in an illusionary way in paiing. how are these works or how are these elements thenntroduced in works of art? this is what we have to look at in order to be able to describe a work effectively. descriptive criticism,irstly, involves the ability to define these terms. and condly, the ability to identify em in separate or individual works of art, for example, as we have distributed here on the wall or hung on the wall. let's first look at or analyze shape and form. what do we mean by shape and form? well, these are clearly discerned. we are talking about color, shapes which our eye clearly distinguishes, and we are able to separate individual shapes of color in the painting that we are looking at. and this is what we mean by shape and form. they can be flat. they can be three-dimensional. what do we mean by mass? and what do we mean by volume? in this painting, for example, by caravaggio, the idea of volume and the idea of mass-- we are dealing with density, with weight. these figures a