One source of matter replication is reminiscent of the ancient technique k nown as alchemy. Replicators that rely on alchemy as their primary means of producing new objects transform one element into another to create the final object. These replicators require a basic object to transform; in most cases, the object to transform must have the same mass as the desired object. This type of replication relies heavily on the science of cold fusion and the ability to alter the most basic building blocks of matter. This form of replication is one of the earliest discovered and requires the most effort to function.