Factory floor grey, where machines hum and pistons pump.
Machinery is a cool grey, close to blue.
It can be described as cool, muted, greyish and dusty.
Set in black, because black reads best on it.
Machinery is a 1920 drawing by American artist Charles Demuth. The drawing depicts a piece of industrial machinery in his hometown of Lancaster, Pennsylvania. The work is currently in the collection of the Metropolitan Museum of Art.
Read on WikipediaA machine is a thermodynamic system that uses power to apply forces and control movement to perform an action. The term is commonly applied to artificial devices, such as those employing engines or motors, but also to natural biological macromolecules, such as molecular machines. Machines can be driven by animals and human power, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
Read on WikipediaNoun