A group of men working on an excavation for a reinforced concrete retaining wall, unfinished reinforced concrete retaining wall to the left of the group of men, illustration, flat colours, engineering, soil mechanics and foundations, soil engineering, emphasis on the retaining wall of reinforced concrete, retaining wall located in the earth, ocher color palette, a retaining wall of reinforced concrete under construction, emphasis on the retaining wall, unfinished wall, heavy machinery, earth supported by the wall, earth supported by the wall, flat colors, ocher color palette, all seen at remoteness, painting