I argue that, if we take the world-time parallel seriously, then those who support Sider’s (2001) argument for unrestricted diachronic composition (UDC), establishing the existence of temporal parts, should also hold that its modal analogue, my argument for unrestricted modal composition (UMC), establishes the existence of modal parts. I formulate the latter argument and develop it by testing it against objections.Editor's Note: Best Conference Paper, 17th Annual Pacific University Undergraduate Philosophy Conference (2013)

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