# Mirror Loom Sandbox *From where do we find our reality?* By [The Mirror and the Loom](https://paragraph.com/@mirrorandloom) ยท 2026-06-04 wolfram, thermodynamics, complexity --- **The bounded observer** ======================== A sandbox you can play with, and a plain walkthrough of what it shows. **The one idea** ---------------- No mind sees all of reality. Your eyes take in a sliver of the light in a room, your brain throws most of it away, and what is left is a compressed, useful sketch you act on. Any observer that is part of the world, whether a cell, a brain, a computer, or an AI, faces the same problem: there is far more going on than it can track, so it must compress. This page lets you measure that. It builds a tiny, fully known toy world, drops a deliberately limited observer inside it, and asks three questions: how much can the observer predict, does changing its viewpoint change what is knowable, and if you run it forward where does the arrow of time come from? The surprise is that the answers are not about the world alone. They are about the fit between the world and the observer looking at it. Run the experiment below... [ The Mirror and the Loom: Bounded Observer Sandbox ------------------------------------------------- One observer, one computationally irreducible world, three views of the same limit: how much it can predict, how its grain changes what is knowable, and how its coarse-graining manufactures the arrow of time. Pick a rule and move the sliders. The rule (single-seed spacetime) The top image is the world running from a single black cell. https://leokold.github.io ](https://leokold.github.io/mirror-loom-sandbox/sandbox.html) --- *Originally published on [The Mirror and the Loom](https://paragraph.com/@mirrorandloom/mirror-loom-sandbox)*