The newest exhibit at the Children’s Museum of Phoenix, this interactive children’s climber is 37 ft tall and is made of 50 tons of structural steel. Because every piece of steel is uniquely placed at an angle, each had to be input into a computer model. Loading the structure with a multitude of one-of-a-kind appendages, including a bathtub, a boat, a rocket and a gang plank, was equally challenging. The 3D model had to calculate the weight and centers of gravity for the bizarre materials, plus the effect of dozens of bouncing child- and adult-sized bodies clamoring throughout the exhibit.