The common theme in these three monochromatic images taken in Paris is that they are about patterns—as seen in three dimensional architectural objects, but reduced to two apparent planes. And also where the patterns end, and where they do not extend.
The image in the courtyard of the palace that houses the Musee Picasso (above) contrasts the regular patterns of windows in the background with the odd shape of the white ball thing in the foreground. Actually, there’s no way to know the scale of the white ball, which is interesting. Photography can render size as an illusion.
Below, the glorification-of-war frieze can be found in the Place Vendome on the very three dimensional Colonne Vendome—a sort of obelisk thing clad in cast-metal, three dimensions attempting to be two dimensions.
Finally, the spectacular colonnade that encompasses the Catholic church of the Madeleine (below) is inherently patterned, and three dimensional. But amid the op-art effect of the recession of the pillars, would you visually understand the three dimensional nature of the scene without the break in the pattern on the upper right?