The answer is motif :) any reoccurring theme, pattern, idea, image etc. in a work applies to this.
for example, an artist that includes flowers in across all of their work (or a series of it) would be depicting a floral motif. I hope this helps!!
The study of Japanese art has frequently been complicated by the definitions and expectations established in the late 19th and early 20th centuries, when Japan was opened to the West. The occasion of dramatically increased interaction with other cultures<span> seemed to require a convenient summary of Japanese </span>aesthetic<span> principles, and Japanese art historians and archaeologists began to construct </span>methodologies<span> to categorize and assess a vast body of material ranging from Neolithic pottery to wood-block prints. Formulated in part from contemporary scholarly </span>assessments<span> and in part from the syntheses of enthusiastic generalists, these theories on the characteristics of Japanese </span>culture<span> and, more</span>
"His concern For light on the sculpted surface." was one of the aspects <span>of Rodin's work that ties him to impressionism. Auguste Rodin was a famous sculptor and painter from the country of France wherein he uses the impressionist's artistic movement which highly emphasises the importance of lighting.</span>