Answer:
"can seldom see through/his bars of rage"
Explanation:
I think its this one because of the comparison of the bars to the rage the bird is in for being kept in a cage.
Cornerstone for me is a 7/10 and the other one a for sure 9/10 :)
Morphological Productivity is a 2001 book by Laurie Bauer explaining productivity in English words.
Originally published: 2001
Original language: English
Publisher: Cambridge University Press
Subject: Morphology
I hope it's helpful