In After Parmenides, Tom Rockmore takes us all the way back to the beginning of Western philosophy, when Parmenides asserted that thought and being are the same. This idea created a division between what the mind constructs as knowable entities and the idea that there is also a mind-independent real, which we can know or fail to know. Rockmore argues that we need to give up on the idea of knowing the real as it is, and instead focus on the objects of cognition that our mind constructs. Though we cannot know mind-independent objects as they "really" are, we can and do know objects as they appear to us.

After Parmenides charts the continual engagement with these ideas of the real and the knowable throughout philosophical history from Plato and Aristotle to Descartes, Kant, Fichte, Hegel, Schopenhauer, Marx, and others. This ambitious book shows how new connections can be made in the history of philosophy when it is reread through a new lens.