This page is the “Format Gallery: Image & Gallery” page template. As the name suggests, this template pulls in all posts that have an “Image” or “Gallery” post format. If the post has an “Image” format, the featured image is displayed. If the post has a “Gallery” format, the first four photos from the gallery are displayed in a block. When selected, photos are displayed using a unique image lightbox by Rogie King.
There are also page templates to do the same thing for each of these post formats individually as well. Two thumbs way up!