When the French architect and designer Pierre Chareau conceived Maison de Verre in 1928 for Parisian art patrons Annie Bernheim and Dr. Jean Dalsace, the homes glass-block faade, which allowed light to pour in by day and glow from within at night, was radically modern.. At that time, Saint-Gobain, which produced the vitreous bricks, couldnt even guarantee that the still-new building material was weatherproof. But nearly a century later the houseand its namesake verrehas shown its staying power in more ways than one.The earliest examples of glass blockssometimes called glass lenseswere actually a quite artisanal product. Handmade from blown glass, the varieties that emerged in the late 1800s were praised for their ability to regulate climate, fend off moisture, and create privacy without eliminating light. Ripe with industrial potential, the hollow blocks found their way into the pioneering International Style architecture of Le Corbusier and others. Still, it wasnt until the 70s and 80s that, cast en masse and relatively simple to install, they became a fixture of Streamline Moderne buildings, SoHo lofts, and, we would be remiss to omit, weird postmodern bathroom renovations.Today, after doing some time as a design dont, theyre back in vogue. At Bridges, a new Manhattan restaurant by AD100 designer Billy Cotton, glass-block walls delineate space while maintaining airy elegance. At a chalet in Megve, Elliot Barnes used it to clad a passageway to an indoor pool. And in a block-encased Los Angeles bathroom, Charlap Hyman & Herrero created a luminous honeycomb.I use it in areas where a bit of privacy and light are needed, explains interior designer Darren Jett, who says, my favoriteapplications are showers, like the round one floating in the middle of a bedroom in our SoHo loft. He doesnt mind the 70s connotation but emphasizes the materials versatility. I imagine a glass-block room with Napoleon III furniture or Art Deco seating and rugsthe tension it creates can be heavenly.