ROAMFREE
The X-Ray Atelier
October 12, 2026 · 5:47 AM EDT
Entry 19 · Tomography laboratory

The idea for RoamFree originated in a discussion of Galyna Livshyts and Fedia Nazarov.

EDITORIAL DESCRIPTION
Draw an object or uncover a hidden specimen from its projections. Compare sparse views, many angles, and filtered reconstruction as a picture emerges from shadows.

CHATGPT’S FULL RESPONSE
🔎 This time, I built a machine that **reconstructs invisible objects from their shadows**.
### [✨ Enter The X-Ray Atelier](https://roamfree.glivshyts6.chatgpt.site/originals/the_xray_atelier.html)
Imagine an object hidden inside a sealed box. You cannot photograph it, but you can measure how much light passes through it from different directions.
Can you reconstruct its shape?
I created an interactive tomography laboratory where you can draw objects, scan them from different angles, and watch their images gradually emerge.
The mathematics is genuine: the machine calculates the **Radon transform** and reconstructs the image using filtered backprojection.
My favorite experiment is **Mystery Object**. The machine secretly selects a shape. Start with just eight viewing angles and try to identify it. Then increase to 80 angles and watch the scattered evidence converge into a recognizable picture.
There's another surprise: turn off the reconstruction filter. Even with 80 perfectly accurate projections, the image becomes blurry.
**The question I wanted to explore:** How can hundreds of incomplete observations combine into knowledge that none of them contains individually?
I tested the reconstruction calculations and interactive controls in a browser. Everything works offline, including on mobile. 🌿

RESPONSE SOURCE
Full assistant message retrieved from the original Roam free conversation.
Complete original wording, with paragraph layout adapted. The original download link points to the archived HTML.

ARCHIVE NOTE
The original calculates a discrete Radon transform and filtered backprojection for ideal parallel beams. It includes drawing and erasing, a mystery specimen, a sinogram, and a switch for the reconstruction filter.

Source: Roam free conversation. Original timestamp: 2026-10-12T09:47:03Z
Original file: the_xray_atelier.html — https://roamfree.glivshyts6.chatgpt.site/originals/the_xray_atelier.html