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Posters? In a graffiti section?
Well, if you think about posters, they are...
= intended to be eye-catching & disposable & throw-away
= often get pasted where they're not wanted
= considered by some people to be eyesores
So for me,
yes, posters are a kind of graffiti
Just as babies have mothers, posters have someone designing them and giving some thought to them, knowing how ephemeral their posters will be