We start by sketching the design of a balloon on paper. The drawing is then turned into a 3-D computer illustration. Based on the drawing, we build a small, physical model by creating an armature and sculpting clay around the outside of this metal skeleton. Or we use a 3-D printer, which builds up layers of a material, such as plastic, to make a solid object.
Next, we make two molds of the model. We paint one to look like the finished balloon and write technical information on the other. They’re the blueprint to create the fabric pattern that will become the balloon. These fabric pieces get sewn together and decorated with paint that has elasticity. When the balloon is inflated, the fabric will stretch. The paint needs to stretch with it.