I did some searching for other works by him and found this review. Hildebrand claims to have uncovered some deep motives that apply to most of Wrights houses which may explain why they are so extremely popular. He bases these motives on notions first identified and defined by Jay Appleton. Appleton noted that prospect and refuge are two conditions that have deep appeal to humans. Prospect means the potential of a site of offering a sight covering a considerable distance.
Refuge means the potential of providing a hiding-place.
Having both a sense for prospect and refuge aids in survival, when one is attracted to find places which enable to see but not to be seen. This is my domain. I believe I was the first person to coin the phrase DAMM back in the early 80's when I was in the Air Force. I was an Air Traffic Controller . I was kicked out of my job because I didn't study hard enough for a Urine Test.