Art takes on different dimensions and meaning. Each artist is unique and expresses their art in different ways. Like Lichtenstein with his pop art photos, many artists choose to explore canvas as their first medium. Canvas is not the sole form of two dimensional art, and three dimensional is also a popular form.
Art in 2-D form means that it is flat. Art in this form can be drawn or painted on canvas and many other surfaces. Some artists prefer to sketch on various types of thin paper as their chosen medium. Others prefer using different types of paints on canvas. Surfaces such as flat walls or wood can be a 2-D surface that an artist chooses to use to relay their ideas.
Three dimensional art is a completely different animal from its flat counterpart. This type of art takes its form from various materials. The materials are usually put together in the form of a sculpture. Sculptures represent what the artist is thinking and feeling at the time of creation of the work. Many contain a message through their design.
No matter what form art will take, it has an objective to relay a thought, a message or feelings. Often this message is cultural, spiritual or political. The art is designed to imitate life; sometimes, with life in turn imitating it. It provokes thoughts and feelings of those who view it. Therefore, one can say that art really has no bounds or no dimensions, since human thought cannot be quantified.