"50 & 60th Library Books Dual Cake. By: nicolevoorhout. I was asked to make a cake for one of the ladies I work with for her 60th birthday she wasn't very forthcoming in ideas and then decided to combine it with another colleague who was turning 50. As they are both librarians I decided to go with the books. Then I had this fab idea to turn it into a trick cake turn it one way and it's the cake for the 50th, turn it around and it's the cake for the 60th!"