Introduction

The Marx Brothers shared an anarchic and irreverent sense of humor. They all liked a roasted potato, and they all hated being made to wait. Philosophers call such shared features universals because they belong to all the members of a class. For instance, humanity belongs universally to all humans. But what exactly is this shared humanity? On the one hand, it seems to have an important role in the world,. And we are all animals, a feature we have the honor of sharing with giraffes among other creatures.