A similar process is at work with social distancing signs. Aradhna Krishna, a professor of marketing at the University of Michigan’s Ross School of Business, is currently working on a universal social distancing symbol with a team of international experts at the University of Lucerne. “An ideal symbol is one that gets noticed and that triggers a natural response in viewers,” she explains, adding that, so far, she has not come across any symbol that could work as a universal marker. But based on her decades-long research on the psychological impact of road signs, she thinks that some current examples can be more effective than others.