I used to wonder how perched boulders were balanced that way. One explanation is that the glaciers dropped them into that position. Then I used to think that someone dragged them into position, which would have been quite an engineering feat. However, the answer is in the photo below.
The perched boulder below is a well-known feature in a RI state park. It is obvious stone was gouged out to the right on this boulder. The long axis faces southeast.
All of these are on hilltops. Creating these took a great deal of work, which I doubt a farmer would want to expend. They were probably created by Native Americans, for some lost purpose. Perhaps a hint comes from Indian legends, in which boulders are animated and capable of movement. These boulders may have represented characters in Indian legends. Or they may symbolize the balance of life and nature.