Joke Collection Website - News headlines - Help, why is "there are signs on campus, just like festivals" a figurative sentence? What is ontology? What is the vehicle?

Help, why is "there are signs on campus, just like festivals" a figurative sentence? What is ontology? What is the vehicle?

This sentence is understood as a figurative sentence because the campus is beautifully decorated or lively with slogans, which is like a festival, not a slogan.

Therefore, its essence is that slogans are posted on campus.

The metaphor is: festivals.