There is an interesting paper, Klin, A., Danovitch, J. H., Merz, A. B., & Volkmar, F. R. (2007). Circumscribed interests in higher functioning individuals with autism spectrum disorders: An exploratory study. Research and Practice for Persons with Severe Disabilities, 32(2), 89-100, in which a number of special interest areas are described and categorised in an effort to highlight how these areas relate to areas of talent that some individuals with autism possess. For example, the paper notes that some children with autism show particular strength in categorising and ordering information, such as being able to relate types of dinosaur to particular geological periods, or, in the case of a student I once worked with, to be able to categorise types of public phone boxes and to order them by the frequency they appeared in local suburbs.