Mask is made from single blank and has retaining section folded into two equal halves which fits around the back of head, mask also being divided into two sections of same size by central fold

摘要

The mask is made from a single blank and has a retaining section (2) folded into two equal halves (2a, 2b). This fits around the back of the head. The mask is also divided into two sections (1a, 1b) of the same size by a central fold (7).