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The intricate choreography necessary to do work in organizations requires effective coordination. This paper uses a variety of data from R & D organizations to describe informal communication and its functions in organizations. It argues that informal communication, generally mediated by physical proximity, is crucial for coordination to occur. Informal communication is frequent in R&D organizations, it aids organizational members in learning about each other and their work, it supports both production work and the social relations that underlie it, and it provides a critical facility that collaborators rely on to start joint work, maintain it, and drive it to conclusion. Without informal communication, many collaborations would undoubtedly not occur and others would break up before becoming successful. In this light we present two telecommunication systems designed to support informal communication through artificial proximity. The VideoWindow system is a wide-screen video teleconferencing system continuously linking public places, and Cruiser is a switched, desk-top video communications system that implements a metaphor of a virtual hallway. Both systems have the potential to support informal communication, but experience with the VideoWindow and analysis of Cruiser suggest that careful attention to implementation detail will determine if they are successful.