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Physical transformation is the act of modifing one's body to resemble one's fursona. In the furry community, it is generally used to refer to the use of surgery to make one's body furry. Some physical transformation is easy to do, and can be done regularly by a number of people; some is difficult, and is only done by a limited number of people in the world; and some is experimental, and currently illegal to perform on humans.
Very simple forms of physical transformation are available through plastic surgery. People can be given forked tongues, have their throats modified to produce purring sounds, have horns or muzzles grown with coral implants, or have their ears stretched out into proper membrane ears. However, these changes are expensive, sometimes require anti-rejection drugs, and are obviously artificial. Most furs who desire physical transformation see current technology as insufficient.
This use of plastic surgery and other physical methods is sometimes known as moreaufication, as in The Island of Dr. Moreau - Moreau used physical 'science' to grant human intelligence (but not mores) to animals.
Near future technology
Most furs, however, refer to a combination of genetic engineering, stem cell organ growth, and chimerazation. Via genetic engineering, a 'pseudo-form' combining both the target's DNA and the DNA sequences for the desired animal traits will be created 'in the lab'. After growing the organs individually to see if the created DNA is viable, full organs would be grown, and chimerazation used to introduce the new amalgamated DNA to the subject as an additional native sequence. While core organs (heart, brain, lungs, liver, kidney) would never have to change, the external organs (skin, claws, tails, et multiple cetera) could undergo massive changes without rejection.
However, while this will have less problems than simple physical, it is also reliant on bleeding-edge technologies, most of which have not been approved for humans; a conservative estimate of the expenses involved in getting the necessary technologies perfected and FDA-approved comes to a half billion dollars (US $500,000,000), and each species would have to have its DNA decoded individually.
Even when the technology is known and the DNA is coded, it would still be a frighteningly expensive process to create a new custom DNA strand, grow cloned organs for this new custom DNA, graft it, and quickly perform the necessary surgery to chimerasize the subject. The costs for transformation, per person, could run as high as twenty million dollars (US $20,000,000). For the time being, physical furries will only be depicted in works of art, and not the works of art themselves.
Despite being another emulation of reality, rather than full transformation, bionics pose a promising possibility. Bionics technology today is on the verge of being able to mirror, if not surpass, natural human ability. it is likely that within a few decades, a visual transformation through use of bionic replacements will be possible.