Its network of epidemiologists, public health experts and urban planners have carried out experiments to tweak the design of blue spaces in cities, measuring the impacts of these changes on human health. In one project in Plymouth, UK, Blue Health worked in communities to rejuvenate run-down public blue spaces. Small-scale changes, like creating a path to the river or adding a small pontoon or seating area, were found to lead to significant improvements in community mood – local residents and visitors reported more positive emotional states and higher life satisfaction after these changes were made.