In this book Kari-Anne Selvik develops a new theoretical approach to the analysis of temporal expressions in sign languages. She provides an alternative analysis of time lines; spatial paths sketched in the space around a signer and used to refer to time. For several decades the notion time line has played a central role in the description of temporal expressions in sign languages. These lines have been treated as independently existing objects in the grammar of many sign languages, and as such they violate a central requirement in Cognitive Grammar: that grammars do not contain arbitrary devices that do not have either phonological or semantic content, or both. The systematic associations between conceptualised spatial paths and conceptualisations of time show that Norwegian Sign Language has developed a metaphorical model for time. Based on examples from Norwegian Sign Language, Selvik illustrates how central aspects of the three Cognitive Linguistics theories Cognitive Grammar, Conceptual Blending Theory, and Conceptual Metaphor Theory can be used to increase our grasp of temporal expressions that previously have been analysed in terms of time lines.