Opening the Drawer

Grading the stall tree on its locked rows produces the most important number in the unit: the gap between memory and learning.

Row seven — rain, weekend, festival, truly sold out. The tree asks its first question: festival — sold out. Correct. Row eight — rain, weekday, festival, truly not sold out. Festival — sold out. Wrong. The scoreboard: training accuracy six of six; test accuracy one of two. Read the gap honestly: the tree did not learn the stall — it learned six Saturdays, perfectly. The festival branch rests on two rows that both happened to sell out, an accident promoted into a confident rule, and the first festival weekday in the drawer broke it. That gap — memory outrunning learning — is the hazard every learner in this unit must manage, and the drawer is the only honest instrument that measures it.