Various kinds of textile structures in Tapestries

It is advisable to clarify some points concerning the textile structure of a tapestry.
They are in all the cases intersections or types of inter-laced threads (or even other material). In weaved technics one places these threads in two perpendicular directions one yielded to the other. The first direction is called "warp": If one places oneself in front of a high warp loom, in fact the threads leave the base of the loom and is taut upwards; in the case of a low warp loom, the threads leave the front of the loom and run horizontaly towards the far end. These warp's threads are always fixed at their end and are thus binded.
In both cases the work of weaving consists in passing others threads in the perpendicular direction of the warp's thread, they are called the weft's threads. Contrary to the precedents, these new threads are not fixed and can thus not be continuous. Indeed they might be changed as soon as a change of color requires. These are the threads which will build the "weft" of the drawing.
With regard to the tapestry to the Petit point the concept of warp and weft only does matter for the groundwork, the canvas, which plays the only part of aid and does not have of this indirect fact an influence on the production of the drawing. Indeed the thread used here to carry out the drawing is brought back on this canvas. It can thus be placed as well along the warp as the weft. It can even be placed not perpendicularly or similarely to the groundwork but also askew compared to it. The best example is the cross stitch which forms, as its name indicates it a cross which crosses with forty five degrees and the warp and the weft of the canvas.