This publication presents an insight into the development of The Sleeping Tree, a sound experience tracing a journey through the siamang habitat of north Sumatra. Using a month long sound capture process to listen to their movements and calls across a vast section of forest in Sikundur. Featuring dispatches, primatology research and insights into the Leuser Ecosystem from the academics, activists, scientists and rangers working to protect this vital habitat.

The Sleeping Tree will premier at Brighton Festival in 2023 and is made in collaboration with LEAP (Landscape Ecology and Primatology) based at Bournemouth University, SOCP (Sumatran Orangutan Conservation Programme) and FKL (Forum Conservation Leuser). Invisible Flock is supported by Arts Council England as a National Portfolio Organisation.