Three patterns are identified to be particularly interesting for architectural and structural
applications: Yoshimura pattern, Miura Ori pattern and Diagonal pattern. The three of them are
based on a combination of simple accordion folding and reverse fold: A series of straight valley and
mountain folds are bent by the reverse folds to form simple curved surfaces.
The reverse fold is one of the base techniques of Origami [3]: A single parallel fold can be bent by a
diagonal crease across the parallel fold. The straight parallel fold bends and reverses from mountain
to valley fold (Fig. 1). At the inversion point two diagonal side creases run to the edge of the
parallel fold. All four creases meet at the inflection point K. The angle of inflection Φ depends on
the opening of the main crease δ and the angle α between the inversed main fold M- and the
diagonal side crease S+ (fig.2). It varies between Φ=180°, δ=180° and Φ=180-2α (δ=0°). In the first
state the paper strip is open and flat in the second one it is completely folded. The acuter α the
bigger Φ.