Approximately 61 million Americans, or one in four U.S. adults, have a disability that affects daily life. Despite the prevalence of disability, accessibility is often an afterthought in technology design. Discussions of accessibility often center on checklists of requirements and whether or not a system has particular features. In this talk, I draw on theories from disability studies to argue for a view of accessibility that is collaboratively negotiated, situated, and enacted. Grounded in extensive field work, I will present three cases of design for accessibility that shift how we think about building systems with and for individuals with disabilities. Collectively, these projects reveal the interactive nature of accessibility that is often missing in individualistic system design and call attention to the importance of the social and political dimensions of accessibility alongside the technological.