Final answer:
Pin curls do not always start at the open end of shaping; the starting point can be the open end or the base, depending on the desired effect and styling goals.
Step-by-step explanation:
Not all pin curls are necessarily started at the open end of shaping. The technique involves starting from either the open end or the base, depending on the desired result. Pin curls can create various effects and are a fundamental technique for creating wave patterns and curls in hair styling. A stylist may choose to start at the base when they want a tighter curl at the scalp or control over the direction of the curl. Alternatively, starting at the open end can create a softer wave and is often used to blend curls into each other for a natural look.