Phantom of the...Library???

In the Scottish Poetry Library in Edinburgh wanders a Phantom (or used to wander). Nobody knows his or her name, but the librarians and the readers happen to come across beautifully crafted sculptures of printed paper. On each sculpture there is a note that addresses to the Library thanking them their "... support on books, words, ideas, and those places that house our treasures" (Phantom's quote). There has been ten sculptures and "thank you" notes from this mysterious artists in the Scottish Poetry Library and none of them identify it's owner. This artist, in my perspective, seems to understand that sometimes being an anonymous character can be a beautiful and powerful quality.