The new Bastide Garden at the Bordeaux Botanical Garden in France by landscape architect Catherine Mosbach is designed to deal with issues of biodiversity, renewable natural resources and the dynamics and mutation of landscapes. The concept is that of the artificial "botanical object" for the layout of the gardens.
a-matter has a nice article about the garden with photos and plans.
Link: a-matter
Visit: Jardin Botanique Bordeaux: La Bastide