Ambient sound is already playing. Beside it, a small simulated world keeps moving.

Weather shifts. Inhabitants go about their business. Events accumulate. Nothing waits for you to press play.

That relationship is the part of mur mur worth noticing. The 2026 project by oio and Mattering pairs simulated environments with evolving ambient sound, so the world you can see is also part of the system shaping what you hear.

The sound has somewhere to come from

mur mur begins with a familiar object: a speaker. But instead of organising the experience around a track list, it gives the sound a place.

There are three: The Block, an urban world; The Plot, a forest; and The Pond, a water ecosystem. oio and Mattering describe the idea as “a place, not a playlist.” The distinction is concrete: the sound is organised around continuing simulated worlds rather than a conventional sequence of selected tracks.

The physical speakers remain prototypes. For now, the clearest way to encounter mur mur is through its live web experience, where the worlds can be watched while their ambient output plays.

Three worlds, three kinds of activity

The worlds are distinguished by what happens inside them, not by any established claim that they use three different audio architectures.

The Block has rush-hour behaviour, street musicians, delivery robots and pigeons. The Plot brings birds, leaves, changing weather and an occasional lost hiker. The Pond adds waves, fish, ducks and passing boats.

Those differences give the listener different kinds of activity to watch: social movement in the city, environmental change in the forest, animals and passing motion on the water. Each world keeps producing situations while the sound continues around it.

Watch the world change

The interface gives you things to look at while you listen: weather, activity, agents or inhabitants, and an Events log recording what is happening inside the simulation. Some world-state information is visible too.

Watch those elements instead of treating the environment as an animated backdrop.

The project describes agents with their own rules and rhythms, changing environmental conditions, and interactions that contribute to the generated soundscape. Weather is also described as affecting behaviour inside the world and the musical layer.

So when the ambience changes, there is a larger system moving behind it. Watch activity build, see conditions shift and hear the soundscape continue to evolve.

The world affects the sound — but you cannot fully decode it

The relationship is clear at the system level: world state, weather, agents and their interactions feed into an evolving soundscape in real time.

The detailed mapping remains opaque. mur mur does not expose enough of its internal logic to trace every audible change back to one visible event. A pigeon moving, a boat passing or the weather shifting cannot automatically be paired with a specific sound. Nor does “generated in real time” mean every individual sound is synthesised from nothing at the moment you hear it.

You can know that the world matters without pretending you know exactly how every part of it matters.

The web radio is where you can test the idea

Because the physical speakers are still prototypes, the web radio is the most direct way to encounter the project now.

There, you can listen to the ambient output while inspecting the simulated environment and, where available, the world-state information and Events log around it.

The web experience is not evidence that the physical prototype runs in exactly the same way. But it makes the central relationship tangible: sound on one side, continuing simulated activity on the other, and enough visibility between them to understand that they belong together.

Look again, then listen again

Return to the sound after watching the world for a while and it reads differently.

It is still ambient. It can still sit quietly in the background. But it is no longer entirely anonymous.

There is weather behind it. There are inhabitants, events and changing conditions to attend to. The system does not reveal every causal link.

What mur mur gives you is simpler: a world to listen through.