This origami sink fold example begins with a waterbomb base, which is a triangle with four flaps. What is a sink fold? It’s purpose is to “cut off” or “sink in” a pointy part of the origami.
Origami Basics: Origami Sink Fold Instructions
Category: Miscellaneous Origami

Difficulty: Easy
This step-by-step guide with clear pictures shows you how to easily make the origami sink fold.
Step 2

2
Fold the tip of the triangle.
Step 3

3
Unfold the tip.
Step 4

4
Open up the triangle.
Step 5

5
Flatten the top so that the whole piece resembles a table
Step 6

6
Then manipulate the creased sides of the triangle so they can come to the center while sinking in the point at the same time.
Step 7

7
Now you are all done with the sink fold.
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