As one artifact of the Slow Create Framework, the pipeline allows you to stack your many canvases all into one single document. This becomes increasingly necessary as you generate more and more canvases - each canvas representing a specific problem or idea area. Having a populated pipeline provides a singular and crystalized view of all of the many ideation or problem-solving situations you're mind is cycling on. This speeds up your mental cycles and also helps to bait-the-hook before traversing the Mindless Work LADDER.
The Canvas allows you to plot out each idea area or problem domain into a single, structured set of boxes we call a Canvas. This structured information becomes your primary, centralized, and organized dataset that your mind can optimally process against on a regular, ongoing basis. Use the Funnel to explain each step within the Canvas.
As you create multiple canvases, it can become hard to keep track of them. The Pipeline organizes all your canvases into a single view. From this one simplified synopsis, your mind can traverse rapidly between problem sets or idea areas on a daily basis.