In this paper, we seek to contribute to the Ubiquitous Computing agenda by focusing on one of its earliest, but most difficult, design ambitions ? making technology "invisible in use". We draw on field studies of domestic life as this domain is becoming increasingly important for new technologies and challenges many of the assumptions we take for granted in the design of technologies for the workplace. We use some examples of domestic routines to identify a number of insights into what it means for features of activities to be "unremarkable". We conclude by using these insights to critique some of the current emphases in Ubiquitous Computing research, and suggest how we might better understand the HCI issues of what will be required to develop technologies that really are "invisible in use". Keywords Ubiquitous Computing, Ethnography; Ambient Intelligence; Tangible Interfaces, Domestic Technology; CSCW