Can we keep up ? illustrates the predicted increased demand for urban domestic water, in a prism map created entirely from real sponges.
They used a laser to cut a sponge into the country shapes. Then, as the ‘making of’ video (below) demonstrates, painstakingly poured water on each so they would rise to different heights, so the depth of each was relative to that nation’s predicted water requirements by 2030. Genius!
Click the map to see the full size version at visualizing.org. Via neatorama.