back

black

boredom

bright

business

close

closed

commercial

construction

counterweights

crude

drilling

energy

environment

equipment

exhaustion

facility

fossil

fuel

gas

global

heavy

industry

large

lit

loop

loopable

looping

machine

mass

metallic

objects

oil

part

pipeline

piston

pollution

power

prosperity

pump

repetition

resource

rig

rusty

silhouette

slow

social

strength

sunrise

sunset

symmetry

togetherness

wealth

well