Triadic Dualism in Photographs
Each crosstie is divided into three by the pair of rails. The crosstie itself is a triadic dualism with a long center part and two short and symmetrically arranged outer parts. In addition, the combination of each crosstie with the two rails forms another triadic dualism.
Looking at the parking meters, we see a pair of actual meters attached to a single post, thuis forming a triadic dualism.
The two car fronts on the right of the picture each form a separate set of triadic dualisms among their lights, fenders and grills.