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what piles up, and what moves it a stock in out you want the level higher. 1  open the tap 2  close the drain 3  either more in less out target a loop low? open the drain opens wide. the level… 1  falls, and stays down 2  falls, then comes back 3  falls, then keeps falling more out high? open also a stock: trust · debt · a backlog · the context window
space pauses · ← → step · 1 2 3 answer
about the picture

Lesson one of a course on holding the model while an AI does the work. The tub is Donella Meadows’s (Thinking in Systems, 2008): a stock is anything that accumulates, it changes only through its flows, and a feedback loop is a flow that the stock itself controls: balancing when it seeks a level, reinforcing when more makes more. The two questions are not a quiz. Committing to an answer before the drawing resolves is what makes the drawing stick; watching alone does not.