What is an ¿Atmosphere¿? As part of the book series ¿Atmospheric Spaces¿, this volume analyses a new phenomenological and aesthetic paradigm based on the notion of the "Atmosphere", conceived as a feeling spread out into the external space rather than asa private mood. The idea of "Atmosphere" is here explored from different perspectives and disciplines, in the context of a full valorization of the so-called ¿affective turn¿ in Humanities.