Philosophy
Foundationalism vs. Coherentism: The Circularity Problem
Quick fact
While foundationalism aims to stop the regress of justification with self-evident or basic beliefs, coherentism embraces a kind of holistic circularity, arguing that beliefs justify each other in a mutually supporting web, much like the coherence of a well-knit story.
Why this is interesting
You're building a tower of reasons for what you believe, but every brick needs another brick underneath. Where does the tower end—or can it stand without a base?