Every day, we use numerous tools or devices to accomplish tasks. These can be as simple and primitive as a branch and rock being used as a lever and fulcrum. Or as complex as the state of the art cell phone or laptop. Nature is awe inspiring in the breadth and depth of beauty and wonder. But technological implements, old or new, working or now broken or rusted, have a beauty of their own. The image doesn't have to depict the entire object. It can be a set of gears of a clock, the number pad on a keyboard, a hammer, or a quarter of a bicycle wheel. It can be in use, idle, or long abandoned. Though there may be some grey areas in terms of what fits, as a guideline, the object in question needs to do something more than merely existing to perform it's function. For example, a well wouldn't fit but the pulley system for moving the bucket would.