I used to have a Jack in the Box. Now I prefer my Jack in a bottle.
About the Jack in the Box
There are several Jack in the Box origami models available, such as the one by Hugo Pereira, but this is my favourite, designed by Max Hulme. It has good clean lines, contrasting colours and the spring mechanism works well. An origami Jack in the Box always makes people smile! I was fortunate enough to attend a British Origami Society Convention a few years ago when Max taught this model. Unfortunately I made a complete mess of it at the time!
Folding the Jack in the Box
The is an intermediate level model. Like all box-pleated models, accurate folding is important to get a good result. It uses a 1:2 ratio rectangle . The dagrams recommend a paper size of 15cm x 30cm (6in x 12in), which results in a box about 2.5cm (about 1in). I made this one out a piece of kami, 10cm x 20cm (about 4in x 8in), which is a little small. Kami is probably not the best choice of paper for this model, as there are a couple of steps in the folding sequence which stresses the paper a bit. I’d suggest a paper with some longer fibres, which will cope better with the folding, and help maintain a good bounce in the spring mechanism. Paper that is coloured differently on each side is not essential, but does make the final result look significantly better.
Diagrams for this model are in Eric Kenneway’s book Complete Origami. Although out of print, this book isn’t hard to get hold of – at the time of writing there were 17 copies for sale on Amazon. The British Origami Society Library also has a copy that members of the Society can borrow.