Markov Blanket

Before time was measured, before the stars found their place in the void, before perception—there was Infinity. Boundless. The tableau of all existence.

From its depths, the first boundary stirred, and the cosmos was set in motion. Not a wall. Just a thin, invisible veil that told the universe: this is inside, and that is outside.

Stars ignited across the void, and within this unfolding vastness, Infinity wove new boundaries.

— Cosmic Mind, Dr Erwin Mind Travel (2025)

In science, this veil has a name. It’s called the Markov Blanket.

It was first introduced by Judea Pearl, a pioneer in probability theory, as an elegant mathematical tool for modelling causality. And yet, its implications reach far beyond math. They touch the essence of what it means to be anything at all.

Just imagine walking along a quiet beach, where smooth pebbles are scattered across the sand. At first glance, it’s chaos. No shape, no structure, no meaning. But then you kneel down and draw a circle in the sand around a small cluster of stones. Inside that hand-drawn boundary, something changes. A shape begins to emerge.

That circle didn’t create the pattern. It revealed it. By limiting the scope of information, the circle defined something meaningful.

That’s what a Markov Blanket does. It shields a system from its surroundings, to let it exist.

And here’s the fascinating part: every information system—animated or not, has a Markov Blanket. Chairs, stars, cells, leaves—they all possess boundaries that define them, hold them together, and separate them from everything else.

All things that persist in time—anything that can be called a thing, have internal coherence. A low-entropy structure. A boundary that holds them together and prevents them from dissolving into the infinite chaos of possibilities.

This is the logic of information theory, and the physics of entropy. According to the second law of thermodynamics, all systems naturally drift toward disorder. Without a boundary, information does not become a form. It stretches, melts, and dissolves into the endless soup of uncertainty.

The Markov Blanket is that structure.

But here’s the wonder: while our Markov Blankets define our boundaries, they do not trap us. We can expand them.

Every new concept you learn, every perspective you absorb, every act of empathy, that is you, stretching the edge of your Markov Blanket.

The more you encompass, the more coherent your system becomes. The more meaningful your existence feels. You are still “you,” but now you contain more.