Visualise what if the taxi is not in the photo. The photo will lack punch in telling the self-importance the stevedore had for himself. He was smoking leisurely with the gear behind him in the middle of a road, seemingly pretending himself as a part of the vehicular traffic.
Here the taxi is the secondary subject supplementing information about the status of the primary subject which is the stevedore. Without the supplementary information, the scene would be less lively and more awkward with the dead space occupying ahead of the stationary primary subject.
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