I think there's something going on with this lot, though I don't know what.
A while back, I mentioned on here I felt there was something "just right" about the Stanton drew NE Circle and someone else said they had felt the same thing.
So maybe there's a proportionality issue, not just a size one - i.e. the relationship between the diameter of the circle and the height of the uprights, at about 6:1 ..........
http://www.heritagecities.com/pdf/aerialofcircus&rc.jpg
http://www.stonepages.com/england/stantondrew.html
;)