One of the amazing things about plants is their ability to change shape in response to environmental stimuli such as light and moisture, even without a brain or central nervous system. Now, a new generation of biomaterials is similarly able to respond to environmental cues… The research started off with cellulose – a material found in plants that changes size in line with humidity levels around it… In terms of borrowing from nature, this adaptive material ticks all the boxes. First, it is made from plant raw materials. Cellulose is an abundant natural material found in the cell walls of plants, fruits, leaves, and vegetables. Second, the cellulose is processed in ways that are inspired by the makeup of biological organisms. In short, it is both a biomaterial (made from biological stuff) and a bio-inspired material (designed based on biological mechanisms).