 In the literature this question explicitly concerns what it is for a material object to lack proper parts, although there is no reason why similar questions cannot be asked of things from other ontological categories.There have been many suggested answers to the Simple Question.Answers include that "x" is a simple if and only it is a point-sized object; that "x" is a simple if and only if it is indivisible; or that "x" is a simple if and only if it is maximally continuous.