a
barb
barbed
base
black
blue
camp
chain
closeup
cold
colony
concentration
cut
democracy
edges
expression
facility
fence
freedom
guard
human
independence
iron
link
mesh
metal
military
north
old
peace
prison
private
property
protection
razor
refugees
rights
secret
security
sharp
sign
sky
strategic
strips
tangle
tape
transparency
wall
war
wire