Here is where all of the individual letters were stored that were used to make the words. If you were to take a old typwriter apart and break the heads off of the swing arms with just the steel letter on it, you would have an idea of the size of the pieces that were used in the racks. All of the capital letters were placed in the "upper case" and all of the lower case letters were stored in the "lower case". Lexi though this was really cool. So did her daddy.