I've never witnessed Icelandic post-rockers Sigur Ros live, but I did attend the first Chicago date of front man Jon Thor "Jonsi" Birgisson's solo tour in April of 2010. To put it mildly, the performance was a masterpiece of spectacle like nothing I'd ever experienced, facilitated by an ornate set built by British theatrical designers Fifty Nine Productions. So I wasn't shocked that Vincent Morisset (who directed the 2008 Arcade Fire documentary Miroir Noir) wanted to follow up director Dean DeBlois's Sigur Ros doc Heima just four years after its release. Inni (translated "inside") is very much about the quartet's other-worldly stagecraft, loaded with lighting magic, suspended illuminated moonballs, and an overall foggy mystery that weave together perfectly with Jonsi's eerie falsetto. Along with help from Godspeed! You Black Emperor's visual collaborating savant, Karl Lemieux, the two 2008 performances at Alexandra Palace around which Inni revolves were filmed digitally and then transferred to 16-millimeter prior to being run through filters galore. The series of manipulations gives the film a grainy and warped atmosphere, one meant to inject the band's signature sensory overload with additional bursts of catharsis (if that's even possible). Though Inni's archival footage is mostly unnecessary—much of it seems like discarded leftovers from Heima—the bridge created between an early, bare-bones performance of the soaring "Popplagið" and a more recent, uber-epic encore rendition (exploding confetti storm included) is well crafted and flat-out cool.