After some fuzzy, frightening, and incredibly heavy EPs, Celestial is where Isis really got their shit together. While it still sometimes sounds a little too Neurosis influenced, there is still a large amount of originality to be found. Aaron Turner's shouted vocals are so incredibly frightening and overbearing, and with those riffs that complement his "singing", it's just the perfect combo. Everything is pieced together into a concept about connected towers, as the cover shows, but the songs seem to actually work just by themselves sometimes. Overall, Celestial is probably Isis's heaviest studio album, but the sense of dynamics and mature sound were already in place.