Both image A and B show composotions where varitons of one well-defined unit are brought together in well-defined reliationships. Also the units are in same dimention. The only difference is that the unit and the compositon are 2D in image A and 3D in image B.
Both of the design in image X and image Y are utilising daylight as a space defining element. On the other hand , image X is doing it by emphasizing the intesinty of light and image Y is doing it with direction of light.