Swinging patio doors—perhaps best known as French doors—date back to the 17th century. Now as then, the design fosters a smooth indoor-outdoor transition, whether they're installed as a single unit or along the full width of a room, as shown here. The attractive door beckons visitors toward the balcony even as it invites air and light inside. JELD-WEN custom wood transoms above the doors take things a step further, intensifying the sense of openness. Taken together, the installation counterbalances the modest size of the room with the expansiveness of the wider world.