background
bar
bars
black
block
building
cage
camp
cell
closed
concept
crime
criminal
depression
despair
escape
flat
freedom
gold
golden
grate
grid
guilt
hope
icon
illustration
incarceration
iron
isolated
jail
justice
law
lock
lockup
metal
prison
prisoner
punishment
rod
room
security
sentence
silver
steel
time
violence
wall
window