Even a fountain may do. A 2010 study (of which White was lead author) found that images of built environments containing water were generally rated just as positively as those of only green space; researchers suggested that the associated soundscape and the quality of light on water might be enough to have a restorative effect.

Although participants rated large bodies of water higher than other aquatic environments (and “swampy areas” were rated significantly less positively), the study suggested that any water is better than none – presenting opportunities for beneficial blue space to be designed or retrofitted. “You can’t change where the coast is, but when we’re talking about translating the benefits to other types of environments, there is nothing to stop a well-designed urban fountain,” says Elliott.