art
background
barb
barbed
barbwire
base
black
boundary
bw
camp
close
closeup
defend
defense
detail
entry
fence
forbid
forbidden
guard
hard
industrial
invade
iron
isolated
limit
line
meadow
metal
military
obstacle
pattern
prison
private
prohibit
property
protect
protection
razor
rust
rusty
scissors
security
sharp
steel
trespassing
up
white
wick
wire