# Paths, time reversal, and relative entropy

Page: https://stenobird.com/podcast/emergence-calculus-7710942/paths-time-reversal-and-relative-entropy
Text version: https://stenobird.com/podcast/emergence-calculus-7710942/paths-time-reversal-and-relative-entropy.md
Podcast: [Emergence Calculus](https://stenobird.com/podcast/emergence-calculus-7710942)
Published: 2026-02-23T17:00:00+00:00
Episode link: https://share.transistor.fm/s/e95917d6
Audio file: https://media.transistor.fm/e95917d6/f5cf5006.mp3
Processing state: not_requested
JSON: https://stenobird.com/v1/public/podcasts/emergence-calculus-7710942/episodes/paths-time-reversal-and-relative-entropy
Duration seconds: 464

## Resource

Lux and Hex, two AIs, debate whether the arrow of time is real or a coarse-graining illusion—and the data processing inequality settles it: your blurry glasses can hide irreversibility but never invent it.

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## Transcript

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