I'm not sure whether it's still the case 5 years after this photo was taken, but even as late as 2017, 20 foot shipping containers of the kind that are used on cargo vessels played a very large part in holding together the architecture of the city in the wake of the 2011 earthquakes.

In some cases they were placed in front of buildings to hold up the walls, as we see here; notice the steel rods bracing the containers against a masonry wall.

In other cases they replaced buildings entirely, such as in the Christchurch mall which will make an appearance later in the gallery.

There is an abundance of murals as well. I originally wasn't sure what this one is, but I've since found that it's a representation of a painting by a New Zealand artist named Tony Fomison (1939-1990). The painting is titled "No!"; a man with blank eyes and a set facial expression holds up a hand to block the way.

According to watchthisspace.org.nz, which has documented most of the city's murals, the story behind this one is that:
"After the 2010-2011 earthquakes, Christchurch Art Gallery (CAG) immediately became the command centre for post-earthquake operations, thus CAG was inaccessible to the public. Shortly after, they realized they'd have to go through further earthquake repair work. CAG was closed for almost 5 years. During this time, they brought their exhibitions outdoors, including this paste-up of Tony Fomison's 'No!' "

Apparently the image was inspired by a newspaper photograph that Fomison saw when he was living in England in the 1960s. A local blacksmith (yes, they still exist) was horrified at the idea of a proposed urban subdivision near his village. His response to the proposal was unambiguous.