@Daniel - the further back you go, the more notable the engravings in books become (see for example the whole family of engravings and copies thereof for the 17th-century "Counts of Holland" series) and sometimes engravings from books are the source for paintings.

@Nemo - I don't follow your thinking on this one - when you say "new Commons pages, do you mean new Wikidata items based on Commons categories? I don't see a problem with that. Things that have needed a category on Wikimedia Commons are probably notable enough for Wikidata (though I can think of some non-notable categories like "1610 engravings" that would be unnecessary on Wikidata)

On Tue, Oct 14, 2014 at 8:39 AM, Federico Leva (Nemo) <nemowiki@gmail.com> wrote:

In my opinion "how many items will X add" is a false problem. If p.a. we moved file categories to subpages as we do on templates, we'd have 20 millions new Commons pages: but the question would be, are they as accessible as they were before? Similarly, the only danger is when items' statements are not transcluded outside Wikidata.
When stuff is in use on projects, as for authority codes; and when it can be edited in-place, as we all do for sitelinks and ru.wiki does for much more: then there is nothing I worry about.

Nemo

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