Adelaide Botanic Gardens nile pond water waterlily white pink adelaide artificial Australia biodome garden humid humidity light mist path rainforest ray steam sveres trees background burst jungle botanical climate enclosed envrionment forest green greenhouse house nature winter angles appearances architectural architecture box-like buildings city colorful colourful contemporary contrast contrasting dark decorated Designs detailed distinctive elements exterior external glass heights heritage high historic linear lines modern New old patterns quality structures style supports Victorian windows cool culture grass grassed area lawns leisure lighting lights outdoors park peaceful pedestrians public park recreation recreational area reflection reflections relaxing river river-views riverside serene serenity sunlight sunshine tranquil walking walkway waterways