 Metaphysical realism is not the same as scientific realism. That the world’s constituents exist mind-independently does not entail that its constituents are as science portrays them. One could adopt an instrumentalist attitude toward the theoretical entities posited by science, continuing to believe that whatever entities the world actually does contain exist independently of our conceptions and perceptions of them. For the same reason, metaphysical realists need not accept that the entities and structures ontologists posit exist mind-independently.