It makes sense to humans (modelers), who can recognize hands, to say “this hand is implemented using quarks”, and “that hand is implemented using sand (which, incidentally, is implemented using quarks)”. But when we say “quarks fully describe a hand” I think part of the meaning is an acknowledgment that reducing to quarks gets you closer to the territory. (Hands are only in our maps.)
It makes sense to humans (modelers), who can recognize hands, to say “this hand is implemented using quarks”, and “that hand is implemented using sand (which, incidentally, is implemented using quarks)”. But when we say “quarks fully describe a hand” I think part of the meaning is an acknowledgment that reducing to quarks gets you closer to the territory. (Hands are only in our maps.)