abstract
arm
background
black
boundary
caught
chain
concept
crime
criminal
danger
detain
fear
fence
finger
freedom
grate
grid
grunge
hand
handle
holding
hostage
imprison
imprisonment
iron
jail
life
metal
people
prevent
prison
prisoner
protect
punishment
restriction
retro
safety
silhouette
steel
thief
violence
white
woman
zoning