published by Aurum Press entitled How to Avoid Huge Ships and Other Implausibly Titled Books. With an introduction written by Joel Rickett, the book was released to celebrate the 30th anniversary of the prize. It featured a collection of book covers from winners and runners-up from previous years. A follow-up book was released in October 2009, entitled Baboon Metaphysics And More Implausibly Titled Books, including an introduction by Bent. Controversy So far, there have been two occasions in which no award has been presented. Bent did not offer a prize in 1987 and 1991, as he felt there was no title that was odd enough to deserve the prize. The prize has become noteworthy enough that, in 2004, The Bookseller castigated publishers for choosing titles with a view to winning it, saying, "There were too many self-consciously titled entries – presumably in a bid to emulate the 2003 champion, Big Book of Lesbian Horse Stories". Bent has also expressed his dislike of people voting for ruder titles, stating that he himself would not have voted for the 2007 winner If You Want Closure in Your Relationship, Start with Your Legs. In 2009, the choice of The 2009–2014 World Outlook for 60-milligram Containers of Fromage Frais as winner of the 2008 award was controversial, as Parker did not write the book himself, but used an automated authoring machine which produces thousands of titles on the basis of Internet and database searches. Philip Stone, charts editor and awards administrator at The Bookseller, commented by saying: "I think it's slightly controversial as it was written by a computer, but given the number of celebrity memoirs out there that are ghostwritten, I don't think it's too strange." In 2018, one of the nominations, Joy of Waterboiling, was controversial because the book was written mostly in German, but the rules of the prize state that only the title needs to be in English in order to qualify for nomination. Diagram of Diagrams Two special anniversary awards known as the "Diagram of Diagrams" (the name reflects the "Booker of Bookers") have been presented to honour both the 15th and the 30th anniversaries of the Diagram Prize. The nominations of the prizes were all of the previous winners up to that point in time. In 1993, the winner of the 15th anniversary award was Proceedings of the Second International Workshop on Nude Mice, the winner of the