Inarchitects made the design for folly number six, but should number six be awarded to another folly, numbers five and nine in order of importance are also acceptable. It is folly not visible at eye level from ground level. How different it was during the war; the farms and stables did not stand out, from the air, because of their appearance. At ETT, no idea what that name stands for, an opening in the landscape is only visible from a great height.