Origami and bookbinding share the same vocabulary of folds. Before a crane, a box, or a sewn pamphlet, there are four creases worth practising until they are automatic. Britannica traces recreational paper folding back centuries in Japan, where the discipline of origami formalised these basic motions into named steps.

A group of traditional origami models folded from coloured and patterned paper
Traditional origami models. Each one is built from repeated valley and mountain folds. Photo: Wikimedia Commons.

Tools you actually need

The starting kit is short. You can fold a respectable crane with nothing but your hands, but three items make every result sharper:

  • A bone folder (or the back of a butter knife) to set creases without burnishing the surface.
  • A square of lightweight paper, roughly 70 to 90 grams per square metre. Heavier stock resists sharp folds.
  • A flat, hard surface. Folding on a soft tablecloth rounds your creases.

Reading paper grain

Machine-made paper has a grain — the direction in which most fibres lie. Folds made along the grain are cleaner and resist cracking; folds across the grain fight back and can split on heavier sheets. To find the grain, gently bow the sheet in both directions; it gives more easily along the grain. Tear a small offcut both ways and keep the easier, straighter tear as your guide.

For a square origami sheet the grain matters less, but the moment you move toward bookbinding it decides whether your pages lie flat. Square your sheet first, then test the grain on a scrap.

The four core folds

  1. Valley fold. Fold the paper toward you. The crease sits below the surface like the bottom of a valley. Align the edges before pressing, then set the crease from the centre outward.
  2. Mountain fold. The reverse: fold away from you so the crease rises like a ridge. In practice you often flip the paper over and make a valley fold, which is the same crease seen from the other side.
  3. Squash fold. Open a folded flap and press it down symmetrically so it flattens into a new shape. This is where flat folding becomes three-dimensional.
  4. Reverse fold. Push a folded point inside-out (inside reverse) or outside-in (outside reverse) along existing creases. It is the move behind a crane's head and a box's corner.

A useful drill: fold a square in half as a valley, unfold, then refold the same crease as a mountain. Feeling the single crease behave both ways teaches your hands the difference faster than reading about it.

Folding in Canadian indoor air

Paper is hygroscopic — it absorbs and releases moisture with the surrounding air. The Canadian Conservation Institute notes that fluctuating relative humidity is one of the main stresses on paper-based materials. In practical terms, a sheet that sat in a heated apartment through a dry prairie winter will be more brittle than the same stock in a humid coastal room. Two habits help:

  • Let paper acclimatise. Leave it flat in the room for a few hours before precise folding so it matches the local humidity.
  • Score brittle stock. On dry, heavy paper, lightly scoring the fold line first reduces cracking along the crease.

Keep going

Comfortable with folds? Move on to Kirigami & Paper Cutting, where folding and cutting combine, or jump to Pamphlet Stitch Bookbinding to turn folded sheets into a book.

References