Nothing is a sociologically neglected terrain, comprising negatively defined phenomena, such as non--identification, non--participation and non--presence. Nevertheless, these symbolic social objects are created and managed through meaningful social interaction. Nothing is accomplished either by active commission (doing/being a non--something) or by passive omission (not--doing/not--being something). I explore these dichotomous forms through four dimensions of negative social space: non--identity, inactivity, absence and silence. Paradoxically, nothing is always productive of something: other symbolic objects come into being through the apprehension of phantoms, imaginaries, replacements and alternatives, which generate further constitutive meanings. A sociological analysis illuminates these processes, revealing how much nothing matters.