Keywords: disability - human - animal - value - reason.
In this essay we reflect on some general theoretical questions about disability, beginning with some absences of ability that are conventionally classed as disabilities (lack of vision, lack of mobility). We move from there to ask whether those of us who are conventionally classed as non-disabled in fact suffer from disabilities, and in particular whether there are disabilities shared by all humans. We reflect on the idea of the superhero, and also on whether it makes sense to envy the abilities of other species that are not shared by human beings. This leads us into a critique of species-relativism about value. We defend the thesis that all value is value for everything. This draws us into some reflections on the importance of ability and disability, and in particular on the practical importance for rational beings of that which they cannot attain.