My introduction to Borges was stumbling across this taxonomy of animals:

    those that belong to the Emperor,
    embalmed ones,
    those that are trained,
    suckling pigs,
    mermaids,
    fabulous ones,
    stray dogs,
    those included in the present classification,
    those that tremble as if they were mad,
    innumerable ones,
    those drawn with a very fine camelhair brush,
    others,
    those that have just broken a flower vase,
    those that from a long way off look like flies.

The mental boundaries that were broken as a result of this list...

https://multicians.org/thvv/borges-animals.html