This study aims to explore 'the common' art ecosystem through the concept and practice of artist collectives which have been developing since the 1990s. 'The individual' and 'the common' are in a mutually dependent relationship, and a collective becomes the condition for the existence of singularity. I examine the concepts and trend of artist collectives in the context of contemporary arts and discuss the characteristics of artist collectives through the case of Ruangrupa and Sweet and Tender Collaborations. First, they emphasize the self-reliant performance of communities. They present an alternative aesthetic that resists the dominant discourse of contemporary arts and neoliberal artistic trends. Second, the main strategy of an artist collective is the collaboration. The members of the collective share their own resources with others and to discover the possibility of arts through diversity and generosity. Third, it is an artistic transition to an ecosystem. Artist collectives focus on building a sustainable environment for artistic creation. In this study, I contend that artist collective can be considered as a place where artists' performances, practices, and political actions occur.