Local density (IMAGE) University of Tokyo Caption These are four different methods for measuring and visualizing density, in this case, the density of people within a physically constrained space. Credit ©2022 Jia Xiaolu et al. Usage Restrictions Credit ©2022 Jia Xiaolu et al. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.