  However, Cartesian intuition, just like conceptual coherence, is not a very discriminating weapon, tending to spread possibility over a wide landscape (cf. Tye 2003, section 4). Cartesian intuition also tends to certify the possibility of scenarios containing zombies, thinking rocks, entirely disembodied minds (not even embodied in ectoplasm), and so forth—all impossibilities, according to the functionalist. So, as with conceptual coherence, any inverted spectrum argument against functionalism that relies on Cartesian intuitions can be converted into an equally plausible and simpler argument that makes no mention of the inverted spectrum.