Which technique is used in the quotation, "Nothing beside remains. Round the decay"?

The technique used in the quotation, "Nothing beside remains. Round the decay" is imagery. Imagery is a literary device that uses descriptive language to create a mental picture for the reader. In this case, the author is using imagery to describe a scene of decay and desolation. The words "nothing beside remains" suggest a scene of emptiness and abandonment, while "round the decay" creates an image of something that is slowly deteriorating or falling apart. This vivid description helps the reader to visualize the scene and understand the mood and atmosphere the author is trying to convey.