This is the Schulenberg Prairie at The Morton Arboretum. According to Jensen, "The plains speak of freedom - earth and sky meet on the far horizon. There is nothing to intercept the vision from the infinite. Perhaps no section of America has so far shown as much power in the development of native art as the prairie country."*

* Siftings, page 28, 1990, The Johns Hopkins University Press. Originally published in 1939 by Ralph Fletcher Seymour, Publisher, Chicago, Illinois.