# Mollick builds a Halloween "ghost census" app with Claude Opus 5.5

> Original title: For Halloween, I asked Opus 5.5 to suggest a spooky project based on my existing work, and it came up with the idea of the ghost census. ...

- Source: Ethan Mollick
- Published: 2026-10-31T14:25:32.000Z
- Bad Influence: https://badinfluence.news/items/xakjk1nq88d6ulpqz068k0voj
- Original: https://x.com/emollick/status/2116537058433081669

## Summary

Ethan Mollick says Claude Opus 5.5 suggested a spooky project based on his existing work, a "ghost census" that counts how many people died within 100 meters of a chosen location throughout history up to a century ago. He published the result at ghost-census.netlify.app.

## Post

For Halloween, I asked Opus 5.5 to suggest a spooky project based on my existing work, and it came up with the idea of the ghost census. Pick a location and see how many people died within a 100 meters of it through all of history up to a century ago.  https://ghost-census.netlify.app/