page is for those who want the instructions to learn how to apply a mountain-fold.
Mountain-fold is one of two important folding technique in origami. Equally important folding technique is valley-fold. If you know these two techniques, then you can fold almost all of simple origami models.
This is an animated instruction so it would be very easy to follow through. You are not required to have any prior knowledge about origami.
The instruction is shown below. Just click on "Ascend" button. You will be given a step-by-step guide. If you miss a step, then just click on "Descend" button to go back to the previous step.
If the screen is blank, just wait until it shows a message saying "Are you ready to get started?". If you find any bugs on this instruction, please send an email to.
If you are ready now, let's have a fun learning to apply a mountain-fold.
Are you ready to get started?
Here you will learn how to apply a mountain-fold in origami and why it is called a mountain-fold.
In this site, a mountain-fold symbol is given as a dashed line of blue or cyan color.
1. Here the mountain-fold symbol is drawn on the vertical half-line of a square paper. So this will be a vertical mountain-fold.
And the arrow is pointing from the left to the right. This means that right-side paper will be folded down.
2. Now, you know how to apply a mountain-fold.
Do you know why this fold is called "mountain-fold"?
3. When a mountain-fold is applied, the paper will be shaped as a mountain.
That is why it is called a mountain-fold.
When you are studying an origami diagram, you will be encountered with line symbols such as dashed line or dot-dashed line.
A simple dashed line represents a valley-fold while a dot-dashed line for a mountain-fold.
Here I use the blue color for a mountain-fold and the red color for a valley-fold just for a convenience.
For an example, if a diagram shows a vertical dot-dashed line in the middle of the paper, it means you should mountain-fold along the line.
If you apply a mountain-fold to the dot-dashed line, the paper will be transformed to form a "mountain-shaped" figure.
The result is exactly opposite when you apply a valley-fold which produces a "valley-shaped" figure.