Re: [Origami] Dry Tension definition
Lang proposes: "Dry tension" folding is a style of origami in which substantial portions of the artwork's appearance are created through the use of unrelieved stresses in the paper, often, but not exclusively, through the use of curved surfaces. A straight or curved fold has tension along the mountain line and compression along the valley line. This tends to flatten the paper unless there are locking folds to contain the stresses. For a curve fold, I propose use of an addition straight fold allowing an overlap and providing two curved surfaces to intersect along the curved fold. There are stresses on the curved surfaces but these are contained and the form maintained. So, I think Robert Lang's definition is quite sufficient. Regards, Cheng Chit
[Origami] What's the right term?
Words often do not convey the correct meaning. I like John Smith's categorization of origami in a 2 x 2 table in his article Art, Origami and Education. On the horizontal axis, he has Techniques divided into Strong and Weak, and on the vertical axis, he has Art, also divided into Strong and Weak. The majority of people are weak in both Techniques (the knowledge) and Art (the application). Technicians or Craftsmen are folders who have skilled in advanced folding techniques. Artists are those who are creative or innovative in the applications of existing folding techniques in their creative works but may not be strong in developing new and more complex techniques. Masters and Experts are at the top. They are innovative in the development of new techniques and in their applications. I think if we can slot the folder and his or her works (and use of terms) in which of the four categories, we should have a much clearer picture of his or her capability. Cheng Chit
Re: [Origami] Tesseract
I had folded a 4-D origami tesseract. But then I unfolded it into a 3D tesseract that has 8 cubes. And now, I cannot remember how to refold it back to a 4D tesseract. :) You can see my unfolded origami tesseract at: http://www.flickr.com/photos/chengchit/3120433792/ Cheng Chit
Re: [Origami] Let's Fold some 3D Origami!
Robert J. Lang rob...@langorigami.com on 11/ 11/13 7:09 am wrote: but I absolutely adore what Rebecca Gieseking has done with the rotational folding concept; it's mind-blowing. (Yes, they REALLY ARE a single uncut sheet.) See http://rebecca.gieseking.us/2013/10/new-work-double-diagonal-shift-vase-2/ and her other postings on this topic. Her double diagonal shift vase is truly creative, which makes me scratch my head to find out how it is done. Think I'll try it on my bottle: http://www.flickr.com/photos/chengchit/8727446787/ Cheng Chit
Re: [Origami] Let's Fold some 3D Origami!
There's an overlap of paper on both sides of the intrinsic straight crease, which is curved in the final model. Robert Lang calls the couplets flanges in his flanged pots. We can, of course, have two intrinsic straight creases for the couplet. The surface of the model will then be polyhedral. Cheng Chit What is the best paper to use? Warps can be a problem. Dianne Stephens To provide sufficient rigidity, use thicker paper like 110 gsm Elephanthide. In Mitani's models, the couplets or flanges are exposed on the outside. It is possible to have the couplets hidden by having them on the other side. For couplets, with two intrinsic straight creases, crimp the couplet at the vertex (point where the polygons meet). For couplets with an intrinsic curved and a straight crease, theoretically, you will have to have an infinite number of crimps on the couplet. Try transforming the intrinsic curved crease into a finite number of straight lines and crimp. This area of 3-D folding is intriguing. We can extend the couplet folding technique to non-rotational symmetric models. Here two of my couplet folded models: http://www.flickr.com/photos/chengchit/8529417567/ http://www.flickr.com/photos/chengchit/6236286619/ Cheng Chit
[Origami] Crane innards
Robert J. Lang rob...@langorigami.com asks: Ever wondered what the origami crane looks like under its skin? Birds don't have tails like (most) mammals have. I mean the tail as the extension of the spine. What appears as a tail in the traditional Japanese origami crane is, in my opinion, the pair of long legs of the bird stretched backwards when flying. Of course, we are free in origami and in other art forms to represent what a crane looks like. Cheng Chit
