Entering the arcade from street level, one sees down into the theater/lecture hall. The decision to bury this space was determined by an adjacent train platform, a level the theater matches for easy access. As well, it appears the architects tried to limit the natural light entering the space, turning the arcade openings into clerestory windows that can be blocked by a dark curtain hung on tracks as well as large translucent shades covering the openings. The most notable aspect of the space -- the U-shaped concrete container -- is a structural solution to removing a floor above that enabled the subterranean level of the theater.

Architectural Documentation Center in Madrid, Spain by Guisado and Fernández-Elorza