I've always thought that rectangular barns were inefficent by any standard. Too much walking, not enough doing. If I were a prophet though, I'd say round barns will have a comeback, especially in smaller dairy operations. Unfortunately modern economics don't allow for small farms to make a return on investment, so they'll have to continue using century old buildings that weren't really suited for dairying anyway. With today's technology you could turn an entire barn into a rotary parlor!
