http://www.sharedencounters.com/

Every day we share encounters with others as we inhabit the space around us. In offering insights and knowledge on this increasingly important topic, this book introduces a range of empirical and theoretical approaches to the study of shared encounters. It highlights the multifaceted nature of collective experience and provides a deeper understanding of the nature and value of shared encounters in everyday life. / We define a shared encounter as:
the interaction between two people or within a group where a sense of performative co-presence is experienced and which is characterised by a mutual recognition of spatial or social proximity