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Two-colorability Angles around a vertex. The construction of origami models is sometimes shown as crease patterns. The major question about such crease patterns is whether a given crease pattern can be folded to a flat model, and if so, how to fold them; this is an NP-complete problem. [32]
A rigid origami model would still be foldable if it was made from glass sheets with hinges in place of its crease lines. However, there is no requirement that the structure start as a single flat sheet – for instance shopping bags with flat bottoms are studied as part of rigid origami.
This includes simple diagrams of basic folds like valley and mountain folds, pleats, reverse folds, squash folds, and sinks. There are also standard named bases which are used in a wide variety of models, for instance the bird base is an intermediate stage in the construction of the flapping bird. [ 25 ]
Blind contour drawing is a drawing exercise, where an artist draws the contour of a subject without looking at the paper. The artistic technique was introduced by Kimon Nicolaïdes in The Natural Way to Draw, and it is further popularized by Betty Edwards as "pure contour drawing" in The New Drawing on the Right Side of the Brain.
Before drawing, the draw plate is held securely in a vise or other fixture. The plate is oriented so that the wider end of a tapered opening can receive a metal wire which is to be pulled through it. Annealed soft, ductile wire is filed at one end to give it an initial taper.
A concertina fold, also known as a zig-zag fold, accordion fold or z-fold, is a continuous parallel folding of brochures and similar printed material in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds.