This paper discusses observations of visitor interactions around a museum installation, focusing on how physical setup and shape of two variants of the installation, a telescope-like viewer and a barrier-free screen, shaped visitor experiences and interactions around and with the system. The analysis investigates contextual embedding, and how the two system variants affected people’s ability of sharing the experience and negotiating use. Author Keywords Shareability, co-experience, museum, interactivity, externalization, context, tangible, embedded, CSCW ACM Classification Keywords H5.2. User Interfaces: Evaluation General Terms Design, Human Factors