Which element of art is characterized as two-dimensional, having only height and width?

The characteristic of being two-dimensional with only height and width clearly defines the element of art known as shape. Shapes are the basic building blocks of visual art and can be geometric, like squares and circles, or organic, like free-form shapes found in nature. They play a crucial role in creating a composition, as well as in conveying visual messages.

Colors can be applied to shapes, but they themselves are not defined by just height and width; they are a separate element used to enhance visual interest and emotional impact. Form, on the other hand, refers to three-dimensional objects that have depth in addition to height and width, which makes it distinct from the two-dimensional nature of shapes. Lastly, texture pertains to the surface quality of an artwork, whether it is actual (tactile) or visual (implied), and thus does not fit the description of having only height and width.

Overall, the definition of shape aligns perfectly with the requirement of being two-dimensional, making it the correct choice.