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Let suspended pendulums drift into traveling waves and return to alignment on an editable rhythm. An ideal small-angle pendulum formula assigns each member an integer cycle count over the recurrence period. Lengths follow the inverse square of angular frequency, and the scene projects their swinging positions into a warm gallery view. The displayed time is accelerated by a factor of four. Reuse supplied assets or quote new media through PopNow.

Uses PopNow for
Music & voice
Needs
Python 3 · FFmpeg

Generation is optional when you have suitable input material.

v1.0.0 · Updated Oct 25, 2026 · 706 KB · Use it for personal and client work; please don't resell or share the package.

What you get

  1. An editable 8-second 720p sample and local MP4 renderer, silent.

  2. Frequency selection, relative lengths and recurrence timing are already coordinated. You can change the number of pendulums or their cycle range without manually keyframing every ball.

  3. A six-frame contact sheet, render receipt and input self-check.

Good for

  • Rhythmic kinetic-art shorts
  • Comparing phase patterns and recurrence times

Not for

  • These are independent ideal small-angle pendulums with scaled display geometry. The renderer does not solve string collisions, large-angle corrections or a physical installation's tolerances.

How it works

Includes a local renderer

  1. Choose the material

    No source image is required. The support, strings, balls and gallery surface are procedural.

  2. Shape the motion

    Edit the documented project controls, then validate the exact settings. Nine to twenty-two pendulums change the wave ensemble.

  3. Render and review

    Export locally to MP4, inspect the contact sheet and watch the whole film. Inspect the changing phase pattern and check that the chosen recurrence fits the requested clip before claiming a full realignment.

How the workflow runs

How Pendulum Wave Ballet works

An ideal small-angle pendulum formula assigns each member an integer cycle count over the recurrence period. Lengths follow the inverse square of angular frequency, and the scene projects their swinging positions into a warm gallery view. The displayed time is accelerated by a factor of four.

What's inside the skill

What you can change

  • Nine to twenty-two pendulums change the wave ensemble.
  • Swing degrees from 8 to 28 control angular amplitude.
  • Recurrence seconds from 6 to 12 set the realignment interval.
  • Base cycles from 4 to 12 set the lowest cycle count; ball_color changes the material.

What to review before delivery

  • The local self-check compares three frame samples after a meaningful input change and rejects its documented invalid case.
  • Output protection rejects overlap with input files and preserves existing sidecars unless overwrite is explicit.
  • Inspect the changing phase pattern and check that the chosen recurrence fits the requested clip before claiming a full realignment. This final visual review is manual.

See the package files

These are selected working files from this edition, with their actual role. The complete download also contains instructions and applicable license notices.

  • The task-specific motion mechanism and supported inputs.

    scripts/scene.py

  • Protected MP4 export, contact sheet and hash receipt.

    scripts/runtime.py

  • Editable settings used by the supplied sample.

    examples/project.json

  • Actual changed-frame, invalid-input and output-protection checks.

    scripts/selftest.py

  • Input ranges, material placement and honest limits.

    references/inputs.md

Why use this skill

Start with this package

Frequency selection, relative lengths and recurrence timing are already coordinated. You can change the number of pendulums or their cycle range without manually keyframing every ball.

What PopNow adds

Use PopNow for the missing Music & voice in this workflow. Keep adequate material you already own, then bring new assets back into the editing and assembly steps described here.

Compare the options

A prompt, your own skill, or this workflow?

Start with a prompt

Your agent can create from a plain request. The brief, visual rules, asset choices, output format and review process still need to be established for that project.

Write your own skill

You choose and maintain the reusable instructions, defaults, file structure and checks. This is useful when your process needs different rules or integrations.

A workflow created for PopNow

This workflow was built for PopNow. Its source files, included dependencies and applicable notices are part of the package; the scope described below belongs to this edition.

Guide reviewed Oct 25, 2026

What will this cost?

The wave and gallery scene render locally from numeric settings. An optional new musical accompaniment is a separate quoted PopNow request; the example does not need generated imagery.

Generation is optional when you have suitable input material. Free skill. New media is quoted before it runs.

The skill package

Free to install under your account's download allowance. The package license covers your own and client work; redistribution is excluded.

Existing assets and local work

Reusing suitable assets, editing files and running local assembly do not call a PopNow generation model. Your computer and any required runtime still do the work.

New AI images, clips or sound

Quoted for the actual model, inputs, count, duration and resolution. Extra alternatives, revisions or optional enhancement passes can add generation requests.

Your agent and hosting

Any subscription, hosted computer, deployment or other provider fee belongs to that service. Installing this skill does not include those services.

Check the cost of your version first

Your assistant can inspect the available models and quote the exact request first. You choose which optional passes to include and approve spending before generation.

Ask your assistant

  • Use the PopNow skill "Pendulum Wave Ballet" for my project. List the inputs you can reuse, quote only the missing media, show the quoted total and flag any unpriced steps. Separate optional enhancements, and wait for my approval before starting anything paid.

How PopNow billing works

Connections using a PopNow API key, including API-key MCP connections, spend from the separate API balance in USD. A ChatGPT or Claude connection authorized through OAuth spends website credits. These balances are separate; the quote shown by your connection is the approval basis.

Download allowances and current account conditions apply. A free package does not mean unlimited free generation.

See model ratesAPI USD balanceWebsite credit packs

How to use it

You say

  • Use the PopNow skill "Pendulum Wave Ballet" (pendulum-wave-ballet) for this: Render the supplied 8-second example. Make a second version with base_cycles set to 5. Show the changed motion and quote any missing media before generation.

Then try

  • Show how the changed setting affects the actual motion.

  • Keep my adequate source material and prepare an optional soundtrack quote.

What to have ready

  • No source image is required. The support, strings, balls and gallery surface are procedural.
  • Python 3, Pillow, NumPy, FFmpeg and ffprobe
  • The project controls listed in the input contract

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Questions

Do the pendulums share one animation phase?

No. Their angular frequencies differ according to integer cycle counts, so the group loses and regains alignment.

Will every duration show a full return?

Only when the chosen clip includes the recurrence time. Changing duration does not automatically redesign that timing.

Can I build an accurate physical installation from it?

No. The display uses ideal small-angle motion and scaled geometry, without tolerances, collisions or large-angle corrections.

What is already packaged in Pendulum Wave Ballet?

The task-specific motion mechanism and supported inputs. Protected MP4 export, contact sheet and hash receipt. Editable settings used by the supplied sample. Actual changed-frame, invalid-input and output-protection checks. Input ranges, material placement and honest limits.

Which parts of Pendulum Wave Ballet can add a charge?

The wave and gallery scene render locally from numeric settings. An optional new musical accompaniment is a separate quoted PopNow request; the example does not need generated imagery. Connections using a PopNow API key, including API-key MCP connections, spend from the separate API balance in USD. A ChatGPT or Claude connection authorized through OAuth spends website credits. These balances are separate; the quote shown by your connection is the approval basis.

How does Pendulum Wave Ballet differ from writing a prompt or my own skill?

Frequency selection, relative lengths and recurrence timing are already coordinated. You can change the number of pendulums or their cycle range without manually keyframing every ball.