 One view is that aesthetic properties depend on the appearances of things—the way things look or sound, for example (see Mitrović 2013, 2018). If so, there is a sense in which aesthetic properties are mind-dependent, since appearances are appearances to some observer. However, some say that there can be aesthetic properties of abstract objects such as mathematical or logical proofs or structures. And some say that ideas or concepts in conceptual art may be the bearers of aesthetic properties. (Schellekens 2007). Those aesthetic properties would be mind-independent. The question of the aesthetic properties of abstract objects is a controversial one (Kivy 1991, Barker 2009).