It's alluding to the underlying master sin; hubris. Hubris deludes us into thinking truth is subjective and therefore something we can recognize, ignore or change at will. Truth is of God and is therefor immutable; that the leaf is green is not Dependant on your recognition of the fact, it just is.
While I don’t think truth is subjective, I do believe that God instills in each of us our own truth. Just between Him each of us. As for the leaf color, that’s just a description of an object. I really doubt God considers anything to do with calling a leaf something, a sin.