According to Storrer, Henry J. Neils was involved in both architectural metals and stone which explains some unusual aspects of this house including aluminum window frames and the stonework that you can see more clearly in a picture at the bottom of this page.
The back of the house overlooks Cedar Lake and is located near the beautiful Lake of the Isles region of Minneapolis. A nice drive if you're in the area some day.
The prow on the edge of the carport reminds me of the prow on the Unitarian Meeting House. A carport in Minnesota winter is not quite as nice as a garage. One wonders whether the owners of the house tried to pursuade Wright to enclose the carport.....
Another example of creative stonework in a Wright building can be found at Taliesin West.