This Eichler's atrium has been covered by a ridge-type skylight, rather than a typical flat skylight. In this picture, the skylight is partially retracted. Look closer, and you'll see that the closer of the two beams has been built up. That's one of the advantages of Eichlers: they have thick beams running the depth of the house that are perfectly suited to support the weight of a retractable skylight. In the image, the close beam is load-bearing, as is the beam inside the wall on the right side.