A glass pavilion refers to a building made mostly or entirely of glass. It is like a transparent house or structure where you can see through the walls and roof. Full definition
The simple square glass pavilion is a powerful expression of his ideas about flexible interior space, defined by transparent walls and supported by an external structural frame. (en.wikipedia.org)
A central glass pavilion (shown in the image above) is the heart of the home, separating the family wing from the guest wing. (onekindesign.com)
Mounira Al Solh, works from I Strongly Believe in Our Right to Be Frivolous, 2012 — 17, graphite on paper, installation view, Glass Pavilions on Kurt - Schumacher - Strasse, Kassel, documenta 14, photo: Fred Dott (documenta14.de)