My third Glaugust post. Prompt: “Perpetual motion”
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An unceasing heart machine is a smooth metal device that replaces an organic heart. It’s powered by the movement of the user and as long as they move it will never stop. Conversely, if the user rests for more than a couple minutes, so will the heart.
Commonly called an iron heart, the unceasing heart machine is about the size of a fist. Surgical installation requires cutting open the recipient’s breastbone, restricting bloodflow with clamps and hemostatic powder, removing the flesh heart with cauterizing tools, and then inserting the metal heart.
After insertion and recovery, the iron hearted may have difficulty adapting to their new organ. The unceasing heart machine is painful to use and creaks like an old door hinge. Sleep is nearly impossible without a specialized limb manipulation and motion harness. Such harnesses resemble a supported treadmill, where a body can “rest” in a facsimile of human waking life, supported by machine arms or human attendants.
An iron heart may last a long time, but the rest of a user’s body is not so durable. Long term survivors of an unceasing heart machine often have extensive prosthetics and mechanical enhancement: clicking fine-iron leg supports, a carved wooden back stabilizer, a spidery, reverse jointed metal hand from a local artificer.
An iron heart is quite valuable, and after its user has died, it will often be extracted, repaired, and installed in someone new. Some say that an iron heart retains some of the memories and feelings of its old owner. Recent recipients might find themselves remembering pasts they never had, nostalgia for places they’ve never been, and love for people long dead.
An evil use of an unceasing heart machine is forced insertion into a slave or other bonded laborer. This is illegal or technically illegal in many places, but in the fertile agricultural lands south of the Glittergold city where slavery is common, many slave owners will install iron hearts in slaves they think will survive the surgery.
Even though the surgery is expensive, slavers see it as a worthwhile investment. The iron heart ensures a laborer will work or at least move all their waking hours and this additional productivity usually pays for the heart in a few years. It also acts as an escape deterrent, as slaves with an iron heart need sleep harnesses to survive, which are hard to find on the run.
For those slaves who do escape, successful reversal of the surgery is rare and difficult. A suitable heart must be found, and few survive a second excavation of their chest cavity. More commonly, escapes slaves will dedicated themselves to some great effort, freeing more slaves, pursuing vengeance, or even simply continuing to work but for wages. For those who cannot escape, it’s not uncommon for iron hearted slaves who no longer wish to live to simply lie down in a field. They will lie as still as they can as their blood shudders to a halt.
In addition to slaves, the old and wealthy may voluntarily take an iron heart to extend their lives. The surgery and new heart may be painful but old age is painful anyway, and an iron heart may easily give another decade of life.
The exercise they take must be continual but it is gentler than the work of a day laborer, and their sleep motion machines are more comfortable. The forced exercise may even be beneficial. In the Glittergold city, groups of old iron hearts might be found walking together. Crude treadmills are common in where the elderly live and work. An eating hall, scriptorium, or courtroom may have them.
Although laborers and the elderly are the most common iron
hearted, a few singular individuals may undertake the surgery as
well. A mad sword saint who wishes to sacrifice their whole self to
their craft might take an iron heart. A vengeful youth, a prophet,
anyone who burns inside already might see little downside to such a
heart.



