Final answer:
The word that refers to the continual application of art elements such as line, shape, or color in an artwork is repetition.
Step-by-step explanation:
The word that refers to the continual application of art elements such as line, shape, or color in an artwork is repetition. Repetition is the use of the same or similar elements multiple times within a composition to create a sense of unity and cohesion. For example, an artist may use repeated lines to create a pattern or repeated shapes to create rhythm in their artwork.