Defensible space produced with lower-end means in Cuzco, Peru: shards of glass and cactus as a deterrent to jump over that wall. The next occurence is less complex but also shows the use of glass:
Defensible space in Peru
in Urban
Defensible space produced with lower-end means in Cuzco, Peru: shards of glass and cactus as a deterrent to jump over that wall. The next occurence is less complex but also shows the use of glass: