I am answering for the first interpretation, as "deep paper" most commonly refers to in technical contexts. Technical Context: 3D Ring Artifacts & Deep Learning
Which of these interpretations were you looking for, or were you referring to something else entirely? [3D] Tamaki (Ring) – NekoPoi
A "papercraft" or physical 3D ring model made of high-quality "deep" paper stock. I am answering for the first interpretation, as
In the field of 3D imaging and computer vision, "Ring Artifacts" are common errors that researchers use to fix. [3D] Tamaki (Ring) – NekoPoi