Open corner windows. The traditional way of making a room is to build four walls, each connected and perpendicular to the adjoining wall. Doors and windows are then cut or "punched" into the walls to connect rooms and introduce light and views. This all started to change in the 19th century when architects started to create "cornerless" rooms. Removing the defined corners of the room was like eliminating the corners of a rectangular bowl. The space within the room, like the water within the bowl, would flow freely, spilling out to the adjoining rooms and the outside, thanks to modern glass and glazing technologies, as can be seen here.