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Sharing online is an important way in which people across the lifespan express themselves, maintain relationships, and connect with others. Yet, people with dementia are often not supported in engaging to the full extent of their abilities, particularly in their interaction with online technology. This paper presents a design case study that examines what it means to design for agency in online sharing involving individuals with dementia. Our work is situated in the context of art therapy for adults with dementia. We present the design and exploration of Moments, a system that allows individuals to share through artwork by manipulating their physical environment. We discuss how designing for agency calls attention to the ways in which the material workspace, including the tools we introduce, and the surrounding social context participate in the creation of agency.