When is a book not a book? When it belonged to Maurice Sendak.

Maurice Sendak, the renowned children's author, tried to split his archive and book collection between a museum/study center at his home, and the Rosenbach Museum in Philadelphia. 

It hasn't worked very well. The estate trustees pulled everything out of the Rosenbach and stored it, and the affair has descended into farce:

In his will, Sendak stated the wish that the Rosenbach receive "all of my rare edition books." 

But the Sendak executors contend that the books in dispute are not rare books - in fact, that they are not even books in some cases - and therefore do not belong to the Rosenbach. The Potter books are children's books, not rare books, the Sendak directors say, and Blake's Songs of Experience and Songs of Innocence are not rare books because one lacks a binding and the other has pages that do not correspond to another copy of the same title. 

The Rosenbach has maintained that all are books, and bolsters that position in its latest filings by ascribing a motive to the Sendak executors: 

"They have done so in order to sell these valuable books at auction to raise money to pursue other purposes they prefer over adherence to Mr. Sendak's directives, including to pay themselves executors' fees, legal fees, and fees for serving as directors of Mr. Sendak's foundation."