These are the keywords that I use to categorize Negative Space pages (these keywords also go into the keywords tag, although I don’t know if search engines care about that anymore).
So, these are specifically-chosen keywords rather than auto-generated keywords. This means that my logic may sometimes escape you on the one hand, but it is also not the equivalent of a full site search: if a page is listed under a keyword, it should have something real to do with that keyword, rather than just mention it in passing.
