Random scenes like that are added in between songs to depict the grandeur of their music, which arguably like no other band's. Filming in black and white with strange, interchangeable visuals, and off-centered and shaky camera work only enhances the effect. I'll admit it's a bit frustrating at times (like how you wish Greengrass would've backed up and replaced his camera with a more stable one while shooting the last 2 Bourne films). But, it reaches a level of mystique, like the beginning of shots of Inland Empire focused on the phonograph. All in all, fans of Sigur Ros should check it out.