This photo by Robert Capa captured members of the International Brigades in the Medical School of the University of Madrid, in the western outskirts of the capital during the Spanish Civil War. I really love in this photo how the natural light coming in from the window highlights the two men and the gun in their hands and makes it the center focal point for the photo. I also think that the contrast between the upper right-hand corner and the lower left-hand corner. The contrast creates a nice balance in the photo.