  If we insist that the Inverted Earth scenario is constrained by actual biology, can it still be maintained that your experiences caused by red things on Inverted Earth have the \(Q_{R}\)-role? That is not clear, even if we grant Block’s claim about the “shift in intentional contents” without a corresponding change in qualia. The problem is twofold. First, because of asymmetries in color space and additional complications (see footnote 23),  to say nothing of the details of the “inverting lenses”, your total functional organization would certainly change in various respects after traveling to a biologically possible Inverted Earth. Second, Block’s description of the long-arm functional theory is highly schematic. It may be that a suitably sophisticated and developed form of this theory would not have the consequence that, on a biologically possible Inverted Earth, your experiences caused by red things have the \(Q_{R}\)-role. Similar points go for an argument against functionalism using a traditional inverted spectrum scenario.