Arque is an experimental wearable robotic tail developed by Keio University researchers. Its designers proposed using it to alter a wearer’s momentum during balance challenges or to deliver full-body haptic feedback. The accessible sources describe those as potential applications, not proven improvements: they report no numerical result showing that Arque improves balance or agility.
What is the Arque robotic tail?
Arque is a wearable artificial tail prototype created by Junichi Nabeshima, MHD Yamen Saraiji, and Kouta Minamizawa, affiliated in the publication record with Keio University’s Graduate School of Media Design. The work was presented as an ACM SIGGRAPH 2019 Emerging Technologies contribution.
The design takes inspiration from animal tails, but its stated purpose is to extend or influence a person’s bodily movement and sensations. It is a research prototype, not an established consumer product.
How does the robotic tail work?
Hackster.io describes a tail assembled from interconnected plastic vertebrae, with protective plates and a weight-adjustment system intended to accommodate wearers of different heights. Elastic cords and springs at the joints provide structure and flexibility. The Keio University publication record characterizes the construction as adjacent, spring-based joints designed to manage shear and tangential forces, with adjustable length and weight.
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Four pneumatic artificial muscles actuate the tail tip. The system uses compressed air, so the reported prototype is tethered to an air compressor rather than operating as a self-contained wearable.
What was Arque designed to do?
Alter momentum during balance challenges
The researchers proposed that active movement of the tail could alter a wearer’s body momentum in balancing situations. That is a design goal, not evidence that users balance better. The accessible article and publication abstract do not give a measured improvement, participant outcome, or agility result.
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Provide full-body haptic feedback
A second proposed use is to move the wearer’s body to convey virtual forces, extending haptic feedback beyond a vibration or sensation at a small contact point. The authors describe this as a potential application; the accessible materials do not establish a quantified user benefit.
Potentially counterbalance carried loads
Hackster.io also suggests the tail might act as a counterweight for workers carrying heavy loads. This is a speculative application described by the article, not a demonstrated workplace benefit or safety intervention.
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Does a robotic tail improve balance or agility?
The sources available here do not establish that it does. Hackster.io’s headline says the design “enhances” balance and agility, but its article describes proposed uses without presenting performance figures. The Keio University record and abstract likewise frame momentum alteration and haptic feedback as potential applications.
The ACM paper itself is linked from the article, but the underlying PDF was not accessible in the materials examined. It would therefore be too broad to claim the full paper contains no evaluation; the supported conclusion is that these accessible sources do not report a numerical balance or agility result.
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What the prototype’s design and evidence mean for readers
- It is an experimental design: the sources identify a research prototype rather than a product shown to be available for purchase.
- It requires external infrastructure: pneumatic actuation depends on compressed air and a tethered compressor in the reported design.
- Its applications remain proposals: balance assistance, full-body haptics, and load counterbalancing should not be read as proven outcomes.
- No commercial availability is established: the cited sources do not say that readers can buy Arque.
The authors’ abstract describes the proposed direction this way: “Here we highlight potential applications for using such prosthetic tail as an extension of human body to provide active momentum alteration in balancing situations, or as a device to alter body momentum for full-body haptic feedback scenarios.”
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Sources
- Hackster.io: “Engineers Design Robotic Tail for Humans That Enhances Balance and Agility”
- Keio University: “Arque artificial biomimicry-inspired tail for extending innate body functions”
- CiNii Research: “Arque”
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