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Illustrated explainer

Lantern

A free Claude skill for moonlit rough-maths explainers

It explains anything like a friend with a pencil, late at night. Someone is about to make a mistake; "don't panic, buddy, we've got you", and a buddy walks in with a lantern. "Well, let's do the maths": a gold line wipes into a blueprint where the figure draws itself, and every number lands on an amber badge that counts up. Everything is flat night illustration: ink-black people and props with a thin gold rim light, a moon with stepped glow rings, a forest, a street lamp, a stall, shelves full of glowing files. The subtitle sits under the picture a few words at a time, the hook and the name get a big headline, and the last shot is the first one, so it loops.

40–60 s9:16 verticalTikTokInstagram ReelsYouTube Shorts

Download lantern.mdReference frames

Free · by Casper

What it makes

  • Moonlit silhouettes with a gold rim light, under a moon with stepped glow rings
  • People who sit, walk in with a lantern and hand things over, drawn in code in any pose
  • "Let's do the maths" as a blueprint: a gold line wipe, figures that draw themselves, a pencil and a ruler
  • Every number on an amber badge that pops in and counts up
  • A subtitle under the picture, a big headline for the hook, and an ending that loops back to the start

Best for: Calm, funny explainers with numbers: what something really costs, how fast or how big it is, and what to do instead.

Twelve frames from a finished Lantern reel, in order
Twelve frames from a finished Lantern reel. The agent gets the same picture to match.

What you need

  • Node 22 or newer
  • Chrome or Edge
  • ffmpeg
  • An ElevenLabs API key (the free plan works to try it)

40 to 60 seconds · One British explainer voice, with free estimated timings before you spend any credits · Drawn in the browser, about 4.5 minutes for a 56-second reel

How to use it

  1. Morphy: it's built in. Open Settings → Community → Playground → Content skills and add Lantern to a chat in one click.
  2. Claude Code: save the file as ~/.claude/skills/lantern/SKILL.md, with the reference frames beside it as reference.jpg, then ask for a video or run /lantern.
  3. Codex or any other agent: add it as a skill, or attach the file to your first message.

Your first video

Make a 50-second Lantern reel: the rough maths of what a $20 AI subscription costs me per finished post.

The agent checks your setup, writes the script, makes the voice, renders a few stills to check and then every frame, and hands you the MP4. Posting it is up to you.

Questions

Is the Lantern format really free?
Yes. Download the .md file: no account, no email, no paywall. Use it for as many videos as you like.
What do the voices cost?
The voice comes from ElevenLabs. Its free plan is enough to try the format (about 10,000 credits a month, roughly one per character of script). Posting videos that promote anything needs a paid plan for the commercial licence, from $6 a month.
Does it work with Codex too?
Yes. It's a standard SKILL.md, the skill format Claude Code and Codex both read, and Morphy has it built in. Any other agent that can run code can follow it if you attach the file.
Do I have to label the video as AI?
On Instagram, a reel narrated by a realistic AI voice needs Meta's AI info label; switch it on when you post. On YouTube and TikTok, check the AI disclosure setting when the content looks realistic.

More free formats

All formats in Library.md
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