In the center there is the Virgin sat on a stone with Child in her
lap.Both rest from the difficulties of the way, at the time that St.
Joseph represented in the most discreet background, approaches them
for the left side with a pitcher of milk.
Another series of curious scenes, taken of apocryphal texts illustrate
the composition. A few fantastic architectures and the presence of
the feet of a sculpture on a sphere, allude symbolically to the episode
known as " The fall of the idols " .Finally, the peasants
to the right are a clear modal of the miracle of the " field
of wheat ", when Jesus made grow the grains this way confuse
the soldiers who they were prosecuting.
Based in:
http://museoprado.mcu.es/egipto.html