A collaboration between the Reef Design Lab and the Sydney Institute of Marine Science, this project, supported by Volvo, is an interesting example of what biomimesis can lead to: The 3D printing of about fifty hexagonal tiles made of concrete reinforced with recycled plastic fibre directly fixed on the seawalls along Sydney Bay in order to encourage the proliferation of marine fauna and flora on the coast. The holding of these tiles is directly inspired by the tangle of the Mangrove trees root system, known to be perfect marine refuges, and on its porous and furrowed surface, which seems to have been created by the gentle water erosion. Marine biodiversity should therefore instinctively cling to it, and molluscs in particular are expected for their amazing filtration and purification capacities (oysters for example), which should find houses more welcoming and protective than on conventional linear dikes, and settle peacefully there to work quietly to recover marine biodiversity.