This is one of the most common bases in origami and it will show up in a ton of models.  It’s sometimes called a square base and sometimes it’s called a preliminary base.

Square Base Step 1

1) Start with the white side up and fold in half with a valley fold.

 

Square Base Step 2

2) This is what the paper looks like folded in half.

 

Square Base Step 3

3) Fold in half again with a valley fold along the red line.

 

Square Base Step 4

4) This is what the paper looks like after the fold.

 

Square Base Step 5

5) Lift up one of the halfs and get ready to push it down like in a squash fold.

 

Square Base Step 6

6) …starting to squash it down.

 

Square Base Step 7

7) …pushing it down completely flat.

 

Square Base Step 8

8) This is what it looks like after you’ve squashed it down.

 

Square Base Step 9

9) Flip the paper over so it looks like this.

 

Square Base Step 10

10) You want to fold the big flap over to the left so there’s a valley fold along the black line. That crease will have been folded both directions.

 

Square Base Step 11

11) You want to squash this flap down like you did on the other side.

 

Square Base Step 12

12) …squashing the paper down.

 

Square Base Step 13

13) The completed square base.

 

Square Base Step 14

If you open the base up you’ll see the follwing mountain (black) and valley (red) folds.

 

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