[kazinator]

That is not strictly true, because being able to transfer the style of Van Gogh onto an arbitrary photographic scene is novel in a sense, but it is interpolative.

Mashups are not purely derivative: the choice of what to mash up carries novelty: two (or more) representations are mashed together which hitherto have not been.

We cannot deny that something is new.

[regularfry]

Innovation itself is frequently defined as the novel combination of pre-existing components. It's mashups all the way down.

[BoorishBears]

I'm saying their comment is calling that not something new.

I don't agree, but by their estimation adding things together is still just using existing things.