This paper explores the implications of metaphorical elements in the context of physical products that coexist with a digital interface, through an empiric and theoretical approach. Further, problematic aspects of the use of metaphors in a digital space will be discussed, and two prototypes will be created to investigate how icons are perceived in different contexts. In cooperation with home-security company Verisure, the prototypes will be produced and usability tested. Fundamental interaction design principles will be implemented in order to investigate the impact of metaphor in iconbased interaction. These findings will be discussed and processed into a set of key factors to consider when working with icons.