OK if there is a tree, you could place them on the tree like ornaments. on top of the shelf. put them behind the book stops. decorate the entrance with paper pine cones. the desk where you checkout the books. also a really good idea is to hang some around the library ceiling. put paper clips and string so they'll be hanging down.
He used linear perspective in Little Nemo, and the techniques he used in Gertie the Dinosaur were keyframes, registration marks, tracing paper, the mutoscope action viewer and animation loops.
