ban
barrier
border
braided
cage
captivity
chain
chained
design
detain
element
enclose
enclosure
fence
freedom
galvanized
gauze
grid
grunge
industrial
industry
iron
jail
keep
keep out
light
link
mesh
metal
net
pattern
prison
protection
restriction
safety
seamless
security
shape
steel
system
texture
tone
wall
white
wire
wired