When we compare the picture with the others we have seen in the same general style of composition, showing a level plain with figures in front, we note how much more detail the background of the Gleaners contains. This is because the figures do not come above the horizon line, as do those in the Angelus and Shepherdess. Hence the eye must be led upward by minor objects, to take in the entire panorama spread before us.
See the Book of Ruth.
Leviticus, chapter xxiii., verse 22.
Deuteronomy, chapter xxiv., verse 19.