Unlike architecture, which requires solidity to provide shelter over time regardless of style, landscaped gardens are ephemeral by nature. They may possess a degree of flamboyancy and fantasy expressive of the philosophical tone of their times and their creators without concerns for function. This is particularly true among the rolling hills of southwest Scotland, where in Portrack, just north of Dumfries near the English border, Charles Jencks, the American theorist, architect, and (increasingly) landscape architect, and his late wife, Maggie Keswick, created a 30-acre garden on a family estate that engages both the mind and the senses. Known as the