A pergola set within a country garden. The design stemmed from Medieval ideas around geometry within the garden as an expression of man's control of nature, and of follies and their function within the landscape to provide a point of interest and reverie. The arrangement is a play on triangles - equilateral triangles in plan and inverted tetrahedrons forming the base. The tetrahedron base negotiates the changing terrain stepping up and down while maintaining a flat plane of the roof.