What is the central theme of the poem "tattoo" by gregg shapiro

Although it seems that the question has not been properly articulated, I believe it is actually referring to a literary movement, which can be consciously created by a group of writers, or conceived and studied by the history of literature after such a group of writers, and their works, existed.

A literary movement, which often aligns itself with other intellectual and artistic contemporary movements, is characterized by the existence of a group of writers and works that share similar characteristics, both formal and aesthetic, ideas or concerns. In addition, those writers and works emulate a common model and/or they share a similar way of looking at the world and of thinking about the role literature plays in that world, and they coincide in the same space and in the same period of time.  

Literary movements are also known as genres, styles or currents. Examples of literary movements are Classicism, Modernism and Realism, to name a few.