Swedish musician Mattias Krantz pulled a live octopus from a fish market and decided to see if it could learn to play the piano. Six months later, Tako — named after the Japanese takoyaki dish — was pulling levers to trigger waterproof keys while Krantz played guitar alongside it.
The project started as a simple curiosity. Krantz built a custom aquatic keyboard with pull-lever mechanics, since octopuses obviously can't press piano keys the way humans do. But motivation proved trickier than engineering. Tako showed little interest in the instrument until Krantz figured out the incentive: a "crab-elevator" that lowered food treats whenever the octopus pulled the correct levers.
Once that clicked, repetition and time did the rest. What began as a rescue story — "I almost forgot sometimes that Tako was destined to become someone's dinner and now we're making music together," Krantz reflected — became something stranger and more intimate: a cross-species collaboration.
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Octopuses have long fascinated neuroscientists. They solve puzzles, use tools, recognize individual humans, and process information in ways radically different from mammals. Their brains are distributed across their arms, not centralized in a head like ours. Studying how Tako learned, how it retained the lever-sequence, and how it responded to musical patterns could offer insights into alternative forms of intelligence and learning.
The experiment also reveals something about attention and motivation across species. Tako didn't learn because Krantz willed it to — it learned because the reward structure made sense to an octopus's brain. That gap between human intention and animal cognition is where the real discovery lives.
Krantz initially planned to return Tako to the ocean. He chose instead to keep the octopus as a permanent companion and occasional musical partner. Whether the experiment "proved" anything scientifically remains an open question. But it documented something harder to quantify: the moment when curiosity, patience, and a waterproof keyboard bridged two entirely different forms of consciousness.
