abstract
architecture
beam
blue
bolt
building
clamps
complicated
construction
crosspiece
day
design
detail
engineering
erection
exterior
factory
frame
framework
girder
gray
high
industrial
industry
iron
joints
joist
lines
metal
metallic
new
outdoors
pattern
pylon
railing
shiny
site
sky
steel
steelwork
strength
structural
structure
support
texture
textured
tower
unit