A "social contract." It means that individuals that have similar objectives work together to benefit off of the relations. These social contracts are the basis of the rule of law. It is however that rule of law itself that makes the social contract codified rather than a custom.
For purposes of these photos, it portrays an art and just as any painting, it used what was available to capture the eye of the beholder, thus, it was manufactured and created resulting in the final product, the photographs.