The first of the two families of folds is the parallel folds. These folds all resemble cylinders or partial cylinders (Figure 3.1). If a sheet of paper is formed into a tube, it is a parallel fold. Parallel folds are so named because the straight lines that run along their length are parallel to each other – in other words, these lines never meet. All of these length lines are also parallel to the hinge line of the fold. Parallel folds can result from cloth lying over a cylindrical shape, or from pressure that pushes the material evenly and bends it evenly.
An important characteristic of parallel folds is that they stay the same size along their length. A parallel fold can come full circle and be sewn to itself to form ...
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