A folly is in the eye of the beholder.

Follies, Grottoes and Garden Buildings, by Gwyn Headley and Wym Meulenkamp.

Folly

A name given to any costly structure considered to have shown folly in the builder,

- Shorter Oxford English Dictionary

But it's much, much more than that. The folly, particularly in Britain, is an attitude, a statement, a style, a fashion, a passion, a different world. . .

Follies may be found all over the world, but the British were first to recognise their worth and importance. . .

Gwyn Headley and Wim Meulenkamp have spent over thirty years reasearching 'rogue architecture'. They are co-founders of the Folly Fellowship.

Above text taken from the blurb on the back cover of Follies Grottoes and Garden Buildings by Headley and Meulenkamp, Aurem Press, 1999