Which type of pincurl is used to create hollow space or flare?

The choice of indentation pincurl is correct because this type of pincurl is specifically designed to create a hollow space or flare within the hairstyle. Indentation pincurls are formed by curling the hair in such a way that they create an inward fold or groove, which results in a hollow effect. This technique is often used to provide volume and shape to the hair, allowing for various styles that require a bit of separation or movement.

In contrast, the other types of pincurls serve different purposes; for instance, half stem pincurls provide some lift but do not create the same hollow effect as indentation curls. Volume pincurls aim to add overall body and fullness to the hairstyle but are not focused on defining hollow spaces. Flat pincurls are typically used to create smooth and sleek styles rather than adding dimension or flare. Each type of pincurl has its unique benefits, making indentation the proper choice for achieving that distinct hollow shape.