[mitjak]

I personally never even made the turtles connection and assumed that, since they are drawing libraries, they are surely referring to the artists.

[damncabbage]

Same, but knowtheory's point rings true now that I've stopped to think about it. (That is, the "witty" pop-culture tie-in being the more likely reason as to why two libraries that do similar things to one named after an unrelated artist got named after the same sculptor.)