How does a cast form a mold?

A cast forms a mold by creating a negative impression of an object, usually made from a material like plaster, silicone, or metal. The process begins by surrounding the object with the mold material, allowing it to harden and capture the object's details. Once the mold is set, the original object is removed, leaving a cavity that can be filled with a casting material, such as resin or liquid metal, to create a replica. This method is widely used in art, manufacturing, and prototyping.