Artistic Expression, Feast in the Sky, Symbolism of the Rooftop as an Interaction, Coexistence of Ephemeral and Special Feelings as a One-Night Event（Contemporary Transformation of Social Rituals Called Parties Located on the Boundary between Earth and Sky「Third Space」of Cities, Modern Society Where the Boundaries between Work and Private Life Are Blurred The changing role of socializing in, Adaptations and Innovations in Modern Urban Life Showed by Creative Reuse of Limited Urban Spaces）, Visual Metaphors of Human Relationships in the Background of Cityscapes（Cultural Processes Where Traditional Forms of Socialization Are Reinterpreted in Modern Urban Environments, Modern Society Where the Boundaries between Work and Private Life Are Blurred, Reevaluating the Value and Meaning of Face-to-Face Interaction in the Digital Age）, Aesthetics of Spatio-temporal Characteristics and Transience of Rooftop Parties（A sense of transcendence and liberation from everyday life due to physical elevation from the hustle and bustle of the city, Expanding Possibilities, New Insights and Sense of Distance into Everyday Life Brought by a Perspective Looking Down from a Height）, Sociological/Aesthetic Significance of the Space Called a City Rooftop（The duality of intimacy and anonymity shown by the contrast between small individual interactions and huge urban structures {x} The borderline temporality of rooftop parties that often take place during the transition period from sunset to night, An Opportunity Symbolizing with a Shining City Background, Creation of Special Spaces Where Urban Rhythms and Natural Cycles Intersect）