This can only be done at a later stage, after considerable practice.
It is important to prepare the fold before executing it. One hand grabs the bottom edge to bring it up to meet the top edge, while the other holds the sheet firmly down on the working surface.
After the two edges are aligned, start flattening the paper, beginning at the point where it is rounded.
After smoothing the paper vertically (as shown in fig. 2), smooth the paper horizontally.
To press the fold permanently and neatly, pass over it with the back of a fingernail, usually the thumbnail (or a bone folder, or the bowl of a spoon, if you prefer).
The completed fold is shown below. It illustrates two important points that can later be used to advantage. The first is color. Classic origami paper is two-colored, that is, white on one side and dyed on the other. Color is extremely useful in diagrams and models for checking whether a sequence of folds has been properly followed.
The second point concerns layers. If a sheet of paper is folded in half, it results in two superimposed layers, color on one side, white on the other. This is obvious in a simple fold. Color is much more significant for more complex models. It enables you to check how carefully you have executed the model. You can check whether a certain layer is colored, as in the illustration, or whether there are more layers in a given area as required by the design, or whether the angle of a corner is more or less as it should be according to the instructions. This is the purpose of a drawing with “borderless” layers.
Generally speaking, unless otherwise indicated, the fold divides the model or one of its parts in half or its multiples (¼, ¹⁄8, ¹⁄16, and so on).
It is essential to learn how to recognize and interpret the details that appear in each image, whether this is a diagram or a completed model.
Chapter 1
THE VALLEY FOLD
TOPICS AND SYMBOLS
| Valley fold indicated by a row of dashes |
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| Arrow indicating the direction of a valley fold |
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| Fold and unfold arrow |
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| Crease created by a fold |
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| Paper edges |
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| Line widths |
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| Numbered steps | 1 - 5 - 8 - 17 - 21 |
PRACTICE MODEL
| Place Card Holder |
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The Valley Fold Line
The valley fold, indicated by a row of dashes, is one of the two basic folds used in origami. In a valley fold, one part of the sheet always remains firmly on the table, while the other is moved into a new position above the part on the solid surface.
To make a valley fold on a sheet of paper, one side of the sheet is lifted from the surface, and then folded into a new specific position. No matter how much a sheet is flattened after a fold is made in this way (fig. 1), the crease will create a little channel, which, if enlarged (fig. 2), resembles a valley.
The Arrow Indicating the Direction of a Valley Fold
An arrow with one tip is used to indicate which edge should be lifted and/or in what direction it should be moved. It can also indicate the exact point to which a given edge should be taken. Here are three examples of arrows associated with the valley fold.
Examples of the use of the valley fold symbol with different arrows.
The bottom edge must be drawn to the top one.
The right edge must be positioned over the left one.
The left corner must be drawn to the opposite (right) one.
The Fold and Unfold Arrow
In origami, every fold serves as the basis for the next one. Sometimes folds need to be unfolded. The fold and unfold maneuver is indicated by an arrow with a curved shaft and two tips, one at each end. Here are some examples.
Several applications of the symbol are illustrated below. The operation required is always the same—fold and unfold.
The Crease Created by a Fold
Once made, a fold is indelible. It is impossible to conceal. But the problem
