Full Idea
Being a physical object (as opposed to being a horse or a statue) really is our most fundamental category for dealing with the external world.
Gist of Idea
Being a physical object is our most fundamental category
Source
Michael Jubien (Analyzing Modality [2007], 2)
Book Reference
'Oxford Studies in Metaphysics vol.3', ed/tr. Zimmerman,Dean W. [OUP 2007], p.110
A Reaction
This raises the interesting question of why any categories should be considered to be more 'fundamental' than others. I can only think that we perceive something to be an object fractionally before we (usually) manage to identify it.