 On this reading, for a class of things to be queer is for their existence to entail a new addition to the bottommost layer of reality. (We leave this metaphor unexplored, since that would mire us in controversy about how best to make sense of the notion of metaphysical fundamentality.) In other words, to determine whether a class of things is queer, we can run something like the following test: take two worlds, W1 and W2. They are qualitatively identical except that W2 has things of kind K, whereas W1 does not. (Or, more precisely, they are qualitatively identical except for the existence of things of kind K in W2, and any other differences entailed ipso facto by the existence of some K things.) Question: are there more kinds of things in the basic layer of reality in W2 than in W1? If so, then K things are queer.