How about the chair, I think a natural state of rest would involve lying down, or standing, or on all fours, but sitting on elevation is a uniquely human invention, as far as I know.
Also I think a lot of industrial machinery, like maybe the steam engine. I can't imagine anything that involes heat rising to make energy or something like that. Maybe also wrenches and nuts and bolts.
Books in general.
The radio, although perhaps antennae are inspired by plants reaching for sunlight?
Computers?! can't seem to find the shape of PC anywhere in nature.
The crucifix? Can't see anything natural creating something so evil.
maybe spiderwebs but i think that is a real stretch.
Bottles seem to be a uniquely human creation.
Office buildings and corporations, gov't structures and institutions are also uniquely human and not found in nature.
Tell me if I'm wrong on any of those.