You then fold it and glue the last flap to form a flat hexagon with 2 faces i.e. front and back.
However, when you flip it, the face on the back comes to the front. (A "face" is a flat side). But when you flip it again, a THIRD face seems to arrive from nowhere! It's very strange, as you'll find out when you make one. Maths magic!
The appalling attack at the Manchester Arena last night is currently being treated as a suspected terrorist incident. All our thoughts are with the fa...