I majored in philosophy in college. At Princeton nearly all liberal arts majors (and many of the engineering students too) have to write a senior thesis to graduate.
I was interested in philosophy of language and wrote a thesis called “Is Metaphor Necessary for Communication?” In it I argued that metaphor was much more than a rhetorical frill but in fact constituted a primary building-block of communication.
Briefly put, I suggested that it’s only through comparisons with existing shared ideas that new ideas (ideas from one person that are new to another) are introduced into a dialogue between two people
In Analogy as the Core of Cognition, a Stanford presidential lecture, Douglas Hofstadter makes a rather similar point:
To me, however, analogy is anything but a bitty blip — rather, it’s the very blue that fills the whole sky of cognition — analogy is everything, or very nearly so, in my view.
I find it particularly interesting that he illustrates some of his points by discussing the process of translation, which was also a topic in my thesis.