Something like the “Dog Dod Grid” from Neal Stephenson’s The Diamond Age... >> Atlantis/Shanghai occupied the loftiest ninety percent of New Chusan's land area

Something like the “Dog Dod Grid” from Neal Stephenson’s The Diamond Age... >> Atlantis/Shanghai occupied the loftiest ninety percent of New Chusan's land area - an inner plateau about a mile above sea level, where the air was cooler and cleaner. Parts of it were marked off with a lovely wrought-iron fence, but the real border was defended by something called the dog pod grid - a swarm of quasi-independent aerostats... >> These pods were programmed to hang in space in a hexagonal grid pattern about ten centimeters apart near the ground (close enough to stop a dog but not a cat, hence "dog pods") and spaced wider as they got higher. Further reading: http://www.technovelgy.com/ct/content.asp?Bnum=243 http://www.technovelgy.com/ct/content.asp?Bnum=243