Why does “broad nape” illustrate ramz?

Taʿrīḍ, Talwīḥ, Ramz, Īmāʾ and Ishārah; the Rhetorical Force of Figurative Speech

• It changes the original addressee
• It portrays honor as a traveler
• The inference toward dullness is short but conventionally obscure
• Five links connect a broad nape to generosity