Figure: The diagonal squares CP, showing the pleated and sunken region on the side.
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This is the CP of a (mostly) standard base. See if you can figure out which one it is. Hint: Can you spot the smaller bird base? B----z first! To get the leg details, note that the front edges of the legs are closed. Also observe the direction of the crimps and reverse folds which form the feet.
The diagrams for this model can also be found on the website. Try and crack the CP first and work out its folding sequence, then compare what you've got with the diagrams.
This model is symmetric about the diagonal. The top left corner of the square is the beak, the bottom right corner is the tail. The other two corners of the square form the wings of the penguin. The top left triangle forming the head is located by making a kite fold division along the diagonal symmetry axis. Once this triangle is defined, the other points are readily located. All the angles on the pattern are 90/45/22.5 degrees.
Collapsing the base: Form the main body, the feet and the tail first. Note where the coloured side of the paper goes in the picture of the model;this will help in forming the wings and the head.
A relatively straightforward CP, with plenty of photos of the finished models from different angles. The creases are all located using angle bisection; it's essentially a bird base type CP. The model has book fold symmetry - the top two corners of the square become the front legs while the bottom two corners form the hind legs. Note that the lower half of the CP is asymmetric about the vertical axis - no, it's not an error!
Collapsing the base: Work from the edges of the square to the centre - it's like trying to collapse a bird base from the edges. Form the mountain folds which define the hexagonal body of the frog, and collapse the rest of the creases around that hexagon. To collapse the hind legs, look at the asymmetry in the lower CP - this asymmetry is from the hidden 45 degree triangular flap formed when the hind legs are folded in half.
Another crane with extra paper grafted on. The square is divided into thirds; as always the shaded areas are extraneous. Sets of parallel lines are characteristic of box pleated forms. These parallel line sets are typical of the multiple sinks used to make flaps narrower. Start folding the pleats from the outside, and slowly work your way towards the middle bird base.
A simple example of a diagonal-squares type CP. The sides of the squares are in a 3:1 ratio, so all you have to do is to crease the paper in quarters to locate all the creases. First collapse the larger bird base, then pleat in the sides. Finally, fold in the smaller bird base. The claws on the hind feet are done with a series of reverse folds.
Figure: The diagonal squares CP,
showing the pleated and sunken region on the side.
Another model with diagonal symmetry. The top left part of the square contain three flaps, one for the eyes, another for the nose and the final one for the lower jaw. The lower right corner of the square becomes the tail. For this CP, the points are again located with kite fold divisions. The basic starting polygon is a symmetric hexagon defined by two kite fold divisions along either end of the diagonal symmetry axis. The legs are formed from the four 135 degree corners of the hexagon.
Collapsing the base: Fold the shaded areas of the paper over; these are unused and just folded along with the rest of the CP (or just cut them away). Do the bird base construction on the bottom right of the square first, then put in the swivel fold constructs on both sides of the diagonal. Once this is done, it should be straightforward to collapse the rest of the paper to form the head region.
This model has a relatively simple folding sequence. It's a good exercise to try and work out the sequence, and then see the relationship between the folding steps and the different regions of the CP.
This CP contains many pleats; this is necessary to achieve the high aspect ratio of the final model. The creases are located by first dividing the model into thirds. The diamond shape on the top left spans two-thirds of the square. The lower right corner of the diamond is a 45 degree angle (two 22.5 degree angles on either side of the diagonal symmetry axis); use the horizontal and vertical pleat lines to locate the rest of the creases of the diamond. The kite form on the bottom right spans across a third of the square and is formed using 22.5 degree angles. Start collapsing the CP from the bottom right corner (the bottom of the scythe handle) and work your way up to the top left corner (the scythe blade). The location of two shallow angle creases on the top and left edge of the square is not crucial; these creases are used to narrow the blade of the scythe.
Figure:Scythe, partially opened base.
Sinking along the green lines will narrow the scythe handle.
Observe how the kite and diamond constructs allow you to change the direction of the parallel creases (from horizontal/vertical lines to 45 degree lines). This direction changing construct is common in other pleated forms.
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