Five standard and identical greenhouses stand in a row. The first three each contain a basic element: air, water or soil. Together they demonstrate the simple requirements that plants need to develop and thrive. Greenhouse four is filled with jungle-like foliage of an eclectic and diverse array of plant forms. Together they represent the complexity of plants in our world.

The last greenhouse contains a smaller greenhouse and sand and is a metaphor for the desertification of Earth, when land becomes degraded and water in short supply, a potential outcome of the so-called runaway greenhouse effect.