Every time I see a particularly filthy curveball catching one of the corners it makes me ponder the question "Is the strike zone 3-dimensional--does it have depth?" It's defined as "the area over home plate", so it does have depth by that defition, though statcast only sees it in two dimensions and I think for most people it's two dimensional. If my geometry is correct, the distance from the front edge to back tip of home plate is 17", and I have seen many late breaking curveballs with a LOT of break happening in that 17" distance--enough at least that during some portion of it's travel through that distance the pitch is both in AND out of the strike zone as I see it.