In fact it has been created as a three dimensional landscape. The scene depicts the sermon on the mount. What is particularly interesting with this painting is that the majority of onlookers are women. Most biblical representations of this scene show mostly men gathered. At the base of the hill is a bag with a tear in it.
Popular opinion says that it is a money sack and that a glint of gold can be seen through the tear.
Notice also the posture of the woman on the right and in the foreground. She is reclining against the man. What is not clear in the photograph is the detail of the background landscape. To the left, built on a hill is what appears to be a splendid castle or monastery. On the right is what appears to part of a walled city or perhaps the ramparts of a castle.