# Clusters > A cluster is a board, and clusters nest inside each other without limit — which is how a project becomes a folder tree without anyone building one. Clusters are never capped on any plan. Each one gets an automatic thumbnail rendered from its actual contents, or a cover image you choose yourself. _Source: https://clusters.soleilpictures.com/docs/clusters · Updated 2026-08-08_ A cluster is the unit of work: a project, a scene, a pitch, a moodboard. The code and the [API](/docs/api/boards) call the same object a **board**. ## Creating one - **New cluster** in the sidebar - `⌘K` → "create cluster" - The **Add cluster** tool on any canvas, which creates it nested inside the current one - Right-click a canvas → Add → Cluster Clusters are **unlimited on every plan**, including free. Only [cards](/docs/canvas/cards) are capped. ## Nesting A cluster inside a cluster appears as a card on the parent's canvas that opens into its own canvas. There is no depth limit. This is how structure emerges without anybody designing it: a film becomes scenes, a scene becomes setups, a setup becomes a reference wall — each a real board you can open, share and work on independently. **Moving** a cluster: drag it in the sidebar tree, or drag it onto another cluster's card on a canvas. Moves are cycle-safe — dragging a cluster into one of its own descendants is refused rather than creating a loop. **Linked clusters** are different: a reference to a cluster that lives elsewhere, placed on this canvas. The board itself does not move. Use it when something belongs in two places. ## Thumbnails Every cluster gets a thumbnail rendered from what is actually on it — a miniature of the board, not a generic icon. It updates as the board changes. To override it, right-click the cluster: - **Cover colour** — a flat colour instead of a render - **Upload custom thumbnail** — your own image, with a 16:9 crop and reposition step - **Reset to auto thumbnail** — back to the generated render A custom thumbnail is respected — editing the board afterwards will not silently overwrite the image you chose. ## Views Every cluster has two views of the same contents: - **[Canvas](/docs/canvas)** — the infinite surface, where position means something - **[List](/docs/clusters/list-view)** — a sortable, searchable file browser Switching does not convert anything. Settings → **Defaults** sets which view new clusters open in. ## Finding clusters - **The sidebar tree** expands lazily, so a deep hierarchy stays fast - **[`⌘K`](/docs/organize/search)** searches cluster names alongside everything else - **Recents** surfaces what you have had open - **[Home](/docs/clusters/home-graph)** shows the whole workspace as a relationship graph - **Shared with me** groups clusters other people have invited you to, by whose workspace they came from ## Deleting Deleting a cluster is a **soft delete**. It goes to the trash and stays restorable for 30 days. See [Trash and recovery](/docs/clusters/trash-and-recovery), which also covers version history and rolling a whole workspace back to a point in time.