In the year 2000 there was a total of fifteen fortified border walls and fences between sovereign nations. Today, physical barriers at sixty-three borders divide nations across four continents. As these walls were being constructed, millions and millions of invisible cosmic particles called muons descended into the earths atmosphere and penetrated meters deep, through layers of concrete, soil and rock. Scientists realized that these deep penetrating particles could be harvested, and a technology could be developed to use their peculiar physical capacities to pass through surfaces previously impervious o x-rays. Muons allowed us to see for the first time the contraband hidden in lead lined shipping containers and secret chambers buried inside the stone walls of the pyramids. Now no wall on earth is impermeable. Today, we're all wall, and no wall at all.