Origami bases are often the starting point of models and projects. The Preliminary Fold, or origami Square Base is one of a group of traditional bases that are used in both traditional and more modern origami design. Although it is very simple to fold, make sure you get the creases the right way round, otherwise you will end up with the Square Base’s close relative – the Waterbomb Base, which uses the same creases, just reversed.
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| Step | Diagram |
|---|---|
| 1. Start with square of paper, coloured side up |  |
| 2. Fold the paper in half diagonally and unfold |  |
| 3. Fold the other diagonal and unfold |  |
| 4. Turn the paper over |  |
| 5. Fold the paper in half, edge to edge and unfold |  |
| 6. Fold the other edge to edge and unfold |  |
| 7. Turn the paper over | |
| 8. Bring the four corners together. You are not looking to create any new folds here. You are collapsing the paper on the folds you have already made |  |
| 9. Squash the base flat. You have completed the Preliminary Fold | |
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