It is part of the definition of classical beauty, but is this art? Perfect proportions and the presentation of naturalistic detail on an ideal frame, the Doryphorus is considered one of the better examples of Greek art.
Except it's Roman. We don't have the original, and the presence of the tree/shrub and the struts holding him in his position clearly mark this as a Roman copy of a Greek work. Is it a copy of something--a product of ratiocination--now that the original is lost? Does its status as a copy alter its beauty?