A model shows selected parts of an idea. The shape should help with a named problem. Today the problem is stopping a pencil rolling on a flat table. A drawing can explain an idea, but only a test can show whether a built version works. Safety: Use a blunt wooden pencil; keep hands clear of its tip. Do not make a holder for real tools, electrical items or heavy objects. Stop: End after one fit check, one local slide and the two feature explanations. No fitting change is required when the pencil already fits. No throwing, dropping or sharp cutting.

Materials: One scrap sheet of paper; Pencil or crayon and a ruler; One wooden pencil to act as the object to hold 1. Place the wooden pencil on the table. If it does not roll, use the design problem as an imagined need and label it imagined. Do not tilt furniture. 2. Draw a holder with a low channel: sketch a flat base and two raised sides. Label base, side and pencil space. Draw an arrow showing where the pencil will sit. 3. Fold the two long edges of the scrap paper upward to form the channel. Adjust the space so the pencil fits between the sides. 4. Place the pencil in the channel. Mark start and end lines 1 cm apart beside the paper edge. Hold only the paper base. Slide that edge between the lines during a slow count of three, without lifting. Record whether the pencil stays between the sides: yes, no or unclear. This is one local slide, not a strength test. 5. Complete both notes: The raised sides help by __. The base helps by __. Record the actual slide result. Mark a real fitting change, or write no fitting change needed. Explain one difference between the paper model and a stronger finished holder. Done: A labelled model links two shape features to the pencil-holding problem and includes one observed test result. Proof: Keep the sketch, model and actual result note. Retain both feature explanations and any no-change note. Record adult folds and supplied ideas. Stop: End after one fit check, one local slide and the two feature explanations. No fitting change is required when the pencil already fits. No throwing, dropping or sharp cutting.