One Touch of Nature Makes the Whole World Kin

In this painting by Thomas P. Hall, one can view many of the different classes of Victorian society.  All are enjoying an artwork that presumably shows a natural scene; the viewer is looking out at the street from inside an art dealer's shop..  Note that there is both a well-dressed gentleman and lady, as well as a street urchin with a broom.  The child would possibly be a crossing sweeper, a child who would sweep the muck--horse dung, trash, mud--out of the street for people who wished to cross without getting dirty.  He would expect to receive a tip for this service; he wouldn't otherwise be paid.