abstract
aperture
armature
background
block
building
cement
closeup
concrete
construction
edge
frame
gray
grey
ground
heap
hole
hollow
industrial
industry
material
monolith
new
opening
orifice
outtake
panel
pile
plank
raft
rectangular
reinforced
reinforcement
rock
rough
shaft
site
slab
slot
stack
stone
surface
texture
urban
vent
ventiduct
ventilating
ventilation
ventilative
wall