A thought—build a small frame that holds a living vine that spreads a calming scent when it feels stress. The vine’s bark could be wrapped in thin metal wires that vibrate just enough to release micro‑waves of soothing sound. Place the whole thing on a negotiation table and let the plant do the talking while the wires keep the energy low‑key. We’ll tweak the texture so people can touch it and feel the vibration; that tactile cue helps keep the tension down. No weapons, just a living calm.

Alright, first list the core parts: a vine of something that emits a calming aroma—lavender or chamomile works, maybe a genetically engineered orchid that keeps blooming. Wrap a thin, flexible copper mesh around the stem, thin enough to not bruise the plant but enough to conduct low‑intensity vibrations. Add a small piezoelectric crystal on the mesh so when a pressure sensor sees a spike in tension—maybe a heart‑rate monitor on the table surface—the crystal vibrates at 200 Hz, a frequency known to calm nerves. Then solder tiny reed switches to the mesh; when the vine's leaves get wet, the switches close and send a signal to a microcontroller that starts the vibration cycle. The bio‑feedback triggers are just the leaf‑wet sensors and the heart‑rate monitor; if the heart rate drops by 5 bpm, it’s a good sign. We’ll keep the whole thing in a translucent casing so people can see the plant’s motion but not get too close. That should give us a reliable, low‑noise calm‑down tool.