untermensche
Contributor
I agree ideas can be abstract.
But not objects.
Objects can have abstract ideas associated with them, but that doesn't make the object abstract.
As far as the mere recognition of an abstract idea.
I don't know if that requires an act of abstraction in itself.
What is "an object"? "Object" is probably the most abstract concept ever!
Objects are clearly seen in the world. Their distinctness from other objects is many times entirely apparent. One apple is clearly distinct from another.
Concepts are ideas that can be abstract.