Installing optical fibre can be a costly and difficult process. One relatively recent option to ease the task is known as air-blown fibre. Rather than installing expensive fibre, one installs tubes, which look like straws that are often bundled together.
The next picture shows a fibre in one of the tubes.
To take matters to the real world, the next picture was taken at the place in a network room where all the various parts of some big network come together. Various pieces of optical fibre are visible. In particular, note the microtubes (making loops!) through which fibre has been blown to other buildings.