 If there are non-objects, some obvious topics to pursue include what they are and what they are like. Here we may appeal to various distinctions metaphysicians have offered across disparate projects. These distinctions may not map precisely onto an object/non-object divide and may not have been formulated explicitly in those terms. But they can still offer insight into what the contrast or complement of object might be and in turn shed light on what the category of object might amount to.