All books can be classified as

  • those that can be used as makeshift steps
  • having moved a reader to tears
  • in need of colour photographs
  • miscellaneous
  • those whose author has exhibited extreme political opinions
  • on the meaning of life
  • biography
  • having been hurled
  • written partly in an invented language
  • of interest chiefly to its own author
  • having a misleading title
  • coming to no conclusion

Inspired by the probably fictitious taxonomy of animals quoted or invented by Jorge Luis Borges, the Celestial Emporium of Benevolent Knowledge’s Taxonomy.