A geometric fever dream in the Hudson Valley, where luminist architecture dissolves into forest, raindrops become a soundtrack, and sunlight feels like the main event. Where are we: The Ex of In House, Rhinebeck, New York How this place got here: Completed in 2016 by Steven Holl—one of the most influential contemporary architects working today—the Ex of In House sits on 28 acres that were originally meant to be split into five suburban homes. Instead, the land was preserved as one continuous property, and this house became the alternative: a structure that somehow reads like both a home and a small, luminous museum. The project of a house comes out of Holl’s ongoing research initiative, “Explorations of IN,” which looks at architecture less as object and more as interior experience—with spaces “shaped from within” and tied closely to their environment.…