A. our theoretical understanding of what things are “really” like (physics, atoms, etc.)

with

B. our direct, first-hand experiences as humans.

Examples:

(1) Ethics – most people experience a visceral feeling that some things are inherently and universally morally wrong (e.g., murdering children). Yet it’s unclear what, in the universe of atoms (or in physics), could make (or explain) something being “wrong.”

(2) Free will – we feel as though we constantly make choices (e.g., picking options that we didn’t have to pick). Yet the possibility of choices is hard to square with the existence of laws of physics as we know them. Where could a choice possibly fit into those laws?

(3) Consciousness – we each know we are conscious (in the sense of having experiences / there being something it is like to be us) because we directly witness our own experiences. Yet it’s unclear how or why configurations of atoms could ever give rise to internal experiences.

(4) Identity – we feel like we have a unique, persistent, indivisible identity. Yet, if we imagine thought experiments involving splitting, copying, or rebuilding brains in the physical world, it’s hard to see how a unitary identity could be maintained in those circumstances.

(5) Knowledge – there seem to be many things we each intuitively know to be true (our own names, what orange juice tastes like, how to tie our shoelaces), yet it’s hard to explain what the state of “knowing” these things corresponds to in the world, or to define what “knowing” is.

(6) Mathematics – we all know it’s true that 1+1 = 2 and that the number 2 “exists” in some sense. But it’s hard to say in what sense this is true/existent because numbers and addition don’t seem to exist in the physical realm the way that, say, a particular sandwich does.

This piece was first written on December 23, 2020, and first appeared on this site on April 17, 2023.