abstract
anchor
background
black
chain
close
closeup
color
concept
conceptual
connection
contrast
dark
detail
diagonal
down
grunge
hard
heavy
industrial
industry
iron
isolated
join
link
linked
metal
metallic
nobody
object
old
one
power
protection
reliable
secure
security
shape
shiny
silver
single
steel
strength
strong
symbol
tangled
texture
tough
up
white