A photochrom taken c. 1902, by Detroit Photographic Co., via Library of Congress Prints and Photographs Division.
Why is any cow, red, black or white, always in just the right place for a picture in any landscape? Like a cypress tree in Italy, she is never wrongly placed. Her outlines quiet down so well into whatever contours surround her. A group of her in the landscape is enchantment.
— Frank Lloyd Wright, from his autobiography
The guides at Taliesin will tell you that Wright strongly preferred buff-colored and brown cows to black and white ones.
enclos*ure 
You have to love a person who has strong preferences in cow colors. Ha!
I think he had strong opinions about everything — I also read that at Taliesin-West he once sent his students out to paint a distant red rock brown.
Color is very important to an artist – an architect – and a gardener.
Absolutely!
(I like your blog. The Virtual Rose Viewing page is useful.)