The presence of wrinkles on the neck, the different grain between croupon and sides, the variety of the physical characteristics in the different points of the hide are not to be considered as "defects" but, on the contrary, as absolutely normal aspects of the hide which evidence its natural origin. If, instead of trying to hide these differences, the objective is to exploit them at their best in order to give to the sofa its own personality and "life", in that we give birth to a charming product, a unique piece. For example, the wrinkles on the neck can be used as a graphic element on the cushions of the back of an armchair which would obviously be cut in order to present wrinkles in the same direction (preferably in horizontal) on all the cushions. The non-uniformity of the grain can be exploited in order to give "movement" to the sitting area or to the arms, trying obviously to maintain a transversal symmetry.
Regarding physical differences, this leads us to some simple considerations, which we can easily show with the help of the figure below:
Zone 1 is perfect for cushions and all the parts which have to grant better resistance.
Zone 2 is equally valid, stating and considering in origin that the natural wrinkles of the neck are not a defect but as a sign of distinction.
Zone 3, due to its lower mechanical resistance and its non-uniform grain (evident also on printed leathers), will be better used to produce parts not subject to stress.
Zone 4, because of its low resistance and consequently high elasticity, have a limited use for parts subject to low stress.
The correct use of leather is made more and more difficult by the fact that, in addition to the structural non-uniformity, we can add a list of defects (cuts, holes, scars etc.) which are different from leather to leather and this makes it difficult to automate the cut. In order to obtain the best possible result working with this type of natural product, a lot of ability and flair are needed, starting from the picture of the sofa which has to be studied according to the typical characteristics of the leather, in order to arrive eventually to the type of cut with which we have to obtain the more visible parts (backs, the upper part of the arms and of the seat) and after the less visible parts (the back of the backs, lateral part of the arms, base of the seat) and at the end those parts which are more or less hidden (inner part of the backs, internal straps of the cushions).
We have discussed the picture of the sofa, because we think that it is more correct to evaluate carefully the natural characteristics of the material which we intend to use as covering and according to that study the shape and size of the sofa, instead of drawing a wonderful sofa but going crazy because hides sufficiently big and of such fine quality from which to obtain pieces which have been drawn with overlarge dimensions do not exist.