How does this artwork elucidate its Identification?
The double herm is important to scholarship since it is the only image that can certainly be said to depict Seneca. The attribution is proven by a Latin inscription on the left side of the bust (from the point of view of someone looking at Seneca), while Socrates is identified by a Greek inscription on the right hand side.  The identification of Socrates can be considered certain based on comparison with many other depictions of Socrates, many of which are of much better quality. The portrait of Seneca on the other hand is used today to identify other portraits and statues of Seneca.
statue Latin herm Socrates Socrate Greek