
Start with the coloured side (here blue) face up

Fold along one diagonal, open it up, then fold along the other. In this picture, the folds are such that that paper forms a cup (rather than a hill).

Turn the paper over, and fold horizontally, open up again, then vertically. These folds end up in the opposite direction to the previous ones.

Squash the paper together, inwards along the folds, so that this square shape is formed.

Fold one of the closed flaps towards the centre |