Dan Roam's "Unfolding the Napkin" is an interactive, four-day visual-thinking workbook designed as a practical companion to The Back of the Napkin
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This is the creative core. By drawing out different scenarios (e.g., a timeline, a flowchart, a comparison matrix), the thinker can "play" with the problem. Roam emphasizes that a single picture is rarely enough; instead, one should draw multiple versions of the same problem to test various angles. The act of erasing and redrawing forces iterative thinking.