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Here you will learn how to apply a closed sink fold in origami.

The "closed sink fold" crease pattern is shown here.

1. Here we will use a balloon base to show how to apply an closed sink fold.

However, an closed sink fold is not restricted to a balloon base. We could have started with a square base instead here.

2. Now, Let's apply an closed sink fold.

Remember that the "closed sink fold" symbol is shown as two solid lines.

3. Prepare to apply horizontal valley-fold and then unfold.

This horizontal valley-fold sets the boundary of closed sink fold.

4. Prepare to turn the base over from the left to the right.

5. Prepare to apply horizontal valley-fold and then unfold.

Again this horizontal valley-fold sets the boundary of closed sink fold.

6. Prepare to turn the base over from the right to the left.

7. Prepare to open the paper.

8. Now, prepare to apply a closed sink-fold.

9. First, prepare to apply a horizontal mountain-fold.

10. Prepare to apply a horizontal valley-fold while applying two mountain-folds.

11. Prepare to apply a horizontal valley-fold.

12. Prepare to tilt the model to see the top hole.

13. Congratulation! You have completed applying a closed sink fold.