Target: test two line treatments on the same observed contour and explain their different emphases. Prepare: A/C, line-lab aid, pencil.
- Launch · 2 min. Show a continuous and broken original contour of A. Ask what differs before asking for meaning.
- Model · 4 min. Trace the fold once with a continuous thin line, then with short repeated marks. Keep the same observed diagonal; vary the mark, not the source. Say “the repeated marks draw my attention to the fold,” an intention, not a guaranteed audience response.
- Guided looking · 5 min. Learners identify line length, spacing, density and contrast, then suggest one possible reading for each with evidence.
- Practice route · 7 min. Choose Day 3 route: make two labelled mark trials and explain which better directs attention to the fold and why.
- Audit · 4 min. Ask whether “interesting” identifies an actual visible choice. Replace it with
closely spaced short marks near the diagonal. - Exit · 3 min. “Name a mark decision and the feature it emphasises.” Expected: specific line evidence, not a generic preference.