Of course this simple designer/user distinction obscures the realities of system development in two ways. First, it draws as unambiguous what is in practice a highly shifting and perspectival boundary, missing the ways in which professional designers are themselves among the most intensive of technology users on the one hand, and making invisible the multiple forms of vernacular design-in-use on the other. At the same time, the distinction closes off our possibilities for recognizing the many subtle and profound differences that actually do divide us, and for replacing the simple opposition of “designer” and “user” with a rich, densely structured landscape of identities and working relations within which we might begin to move with some awareness and clarity of our various positions.