Analogizing

The domain is clothing; the structure is the class

L1Beginner

Structure Mapping: A Dam and SavingsStart →
Structure Mapping: A Conductor and an Operating SystemStart →

L2Skilled

Forced Connection: Immune System × Spam FilterStart →
Forced Connection: Commute Navigation × Project ScheduleStart →

L3Expert

Transplanting a Solution: Borrowing from the Immune SystemStart →