This is a gallery post, with a ‘featured image’ (which in our theme just plants it at the top of the post) and the category of Canadiana. You can use it if, say, someone sends you a picture gallery of Canadian map librarians.
Here, we see the 6 portraits of actual people that you find when you do a Google Image search for “Canadian map librarians.” They must be the most important Canadian map librarians. Below that, I’ve put in the media gallery–but I’m not sure if that’s what meant by a gallery post. It really blows up these images, and I can’t seem to control how big the gallery is.