Daily rainshowers, peat bogs, and heavy, wet clay didn't dampen efforts to create a 4.5-acre concrete tropical landscape in less than 7 months for a Puerto Rican hotel. Concrete contractors were needed to pour more than 450 cubic yards of concrete. Creating cliffs and boulders on what once was a flat lawn required duplicating nature in concrete. The workers created molds by coating rugged basalt cliff formations in the northwood hills of Minnesota with rubber. The concrete is a blend of alkali-resistant (AR) glass fiber chopped into strands and blown into a stream of sand, cement, and color. The workers attached the custom rock castings to gunite or formed structural concrete onsite with expander-type bolts. Using wire mesh and concrete, they hand filled the irregular spaces between castings.