After you have a the basic notion of a design, you will make a full-scale, three dimensional prototype. After it is complete, you will make a plaster mold of the prototype. In some cases the prototype will survive the mold making process and in others it is destroyed while removing it from the newly made mold.
Your prototype could be made of clay, plastic, wood, plaster, metal, rubber, glass, organic material such as plants, fruit, or vegetables, or any material that will withstand the mold making process. With softer materials, the prototype is destroyed while removing it from the mold. Plaster, glass, metal, rubber and other materials are usually unaffected by mold making.
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