This Metal Jellyfish Kinetic Sculpture is by mechanical artist Eli Yoo.
The video appears to be an animation, but if the real deal does in fact move like that, I'm impressed.
"Despite their apparent intricacy, the pieces are surprisingly minimalist. We use the bare minimum to replicate each motion, without unnecessary ornamentation or flourish. To capture [a] reverence for nature, we use a pallet of gears, cranks, sliders, levers, and chain links."
"We have originally designed and handcrafted this beautiful and elegant jellyfish by using a variety of metals like stainless steel, aluminum, brass, bronze, and copper. We make it move and feel 'alive.'"
Yoo is selling these for $489 on Etsy.
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Comments
Looks like it could be accomplished with an epicyclic gear set - motor in base with shaft driving the sun gear up the center post. The underside of the bell is the carrier, planetary gears for the tentacles, and ring gear for the bell. I would guess that this is where they started or were inspired, and if they are actually using sliders and levers it is to tweak rotation speeds (which could possibly be handled via gear reduction if necessary. Chains or belts or levers would just make it squeakier over time I think. I love the elegance of the organization of tentacles, the proportions and the flow created by the helix angle of the tentacles. Very nice!