And it's doing nothing else all day

It lifts containers from A to B, is indispensable in ports and harbours and full of technology - it is a spreader ...



as an introduction:

The spreader is a device used for lifting containers and unitized cargo.

The spreader used for containers has a locking mechanism (called twist lock) at each corner that attaches the four corners of the container. A spreader can be used on a container crane, a straddle carrier and at any other machinery to lift containers.

»»» http://en.wikipedia.org/wiki/Spreader_%28container%29