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
