I never actually observed this but thought of it as a joke. The idea of a rubbish dump containing historically valuable and precious things has always amused me. In this case Vincent van Gogh’s chair, as depicted in his one of his paintings, having been thrown out by a houseproud villager. The chair has fallen partially outside the frame of the painting. That should remind you, the viewer, that this is not reality.
The top and bottom of the painting are complementary blue ( the dark sky) and yellow (the chair). The largest part of the painting is green (the trees and the grass) while the complementary red (the rooftop) is placed in the distance much as John Constable included little spots of red in his landscapes. I also deliberately included another joke by introducing a Rothko like composition of large dark rectangles on a dark ground.