Society, in general. In essence, Shakespeare aims to say we are all just pretending in front of other people, like a facade. We will have our moments and our downs. The “one man pays many parts” can be how a person can pretend to be something they are not to get others to like them. Like trying to fit in one group, you’ll pretend to be into what they are or etc. Can be applied in the dating scene, friendships, work and other forms of social life.
There are millions of things
The answer will be true. Whenever you are writing a narrative, you have to provide some sort of description throughout it.
I believe it is a metaphor because it compares the public and swine without the use of like or as.
