This activity teaches that a single prompt produces variation when repeated. The student is not asked to make sixteen different things. They are asked to make the same thing sixteen times and watch what happens. The variation emerges from the constraint, not from inspiration. By square ten, the student has run out of obvious approaches and starts to invent. That invention under pressure is the curriculum content. Some students will want to plan the sixteen versions. Stop them. The activity only works if they discover each new version as they go.