 The upper level exhibits are open-air, enclosed only by a large stainless steel mesh roof structure supported by curved beams, which were designed to look like the ribs of the rainbow serpent of Aboriginal myth when viewed from above.This open-air feature has enabled the exhibits to be landscaped naturally with live plants, including full-sized trees.The largest exhibit is the semi-arid habitat of kangaroo walkabout, featuring of red sand trucked in from central Australia and full-sized bottle trees.