Husband and wife team Sean and Steph Mayo are known for being among the craziest builders out there, churning out stunning models at an unbelievable pace. Their latest work, built for the on-going Iron Builder contest (where they’re up against stiff competition, even for them!) is a mind-blowing coral reef, all decked out in the wildest underwater colors and vibrant with sea-life. Many of LEGO’s lesser-known parts lend themselves well to creating the organic shapes of coral-dwelling creatures, and it’s amazing to see how life-like some of them can be (like the sea anemone Nemo is hiding in on the far left).