Applied Network Security Density

I recently visited Tokyo, Japan. Just as always, my curiosity got the best of me and I started to calculate the population density of the buildings where I was staying. Giving fudge factor of non-populated apartments, I estimated 8,500 families in twelve 15 story buildings, living in a 1.5 mile square piece of land.That’s CRAZY. Mass transit and unrestricted modes of transit are not a whim, they are a requirement. I bet you’re asking how this applies to security, or for that matter computers at all.