‘Maison de Verre’ (1930) in Paris by Pierre Chareau.
Built beneath an existing apartment, Chareau turned an impossible constraint into a glowing composition of glass blocks, steel, and movable screens.
Reading Between the Lines (2011) in Belgium by Gijs Van Vaerenbergh.
Belgi
A church that almost disappears into the landscape. Built from 2,000 small columns, it shifts between solid and transparent as you move around it.