I've spent a little time considering what this class of things would be. It's like trying to turn a forgetful functor into a homotopy transformation and having some kind of universal measure of the distance from the end of the transformation.

But we don't actually know if evolution doesn't abstract. It's possible that our genome has been around long enough to develop tendencies to cause mutations that change us in certain ways that might be considered "abstract". For instance, we might be able to mutate longer or shorter arms or legs.

This notion should be supported by the fact that we don't mutate in completely random ways, and the fact that most mutations don't kill us.

Unless it's designed to be obfuscated. Which is a very big "unless" IMO :)