#### <sup>[Ollin](../../index.md) → [Documentation](../index.md) → Core</sup>

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## Core

- [`Sketch`](sketch.md) - the lifecycle (`setup`/`draw`), the temporal state (`time`, `frameCount`, …), and loop control
- [`Canvas`](canvas.md) - `scale`, the `canvasSize` export presets, and the preview window (`windowMode`)
- [`Variations`](variations.md) - `variation`, the seed a run starts from. In the inspector you can step, roll, and jump through a sketch's variation space. You can also preview a range as a contact sheet (`--export-grid`), then re-render the one you want to keep with `--seed`
- [`Replay`](replay.md) - record a run's seed, clock, inputs, and parameter changes as a take (`--record-take`). Then play it back exactly (`--replay`, with transport keys), scrub through it, and re-render the performance through any export flag
- [`Automation`](automation.md) - keyframed parameters. Write a parameter's values down over time (`automate`) and shape them with named or Bezier curves. You can then loop them, play them at any speed, read them from a file (`--automation`), and render them exactly in any export