Below is an image that illustrates all 3 ways in which different colours can meet. The pattern you see here is entirely composed of horizontal ‘wefts’ woven across vertical ‘warps’.
Horizontal divisions. To place 2 different colours next to each other is very easy if they are divided horizontally.
Vertical divisions They will appear as a slit (figure 2) just short enough to avoid large and potentially unstable gaps in the weaving. Another way to create vertical divisions is to ‘mesh’ the two colours together (figure 3) which is strong but makes the weave thicker where 2 wefts instead of one pass round the same warp.
Diagonal divisions. These are created by forming small steps as shown in figure 4.
All these limitations and technical results have caused weavers be clever. Immensely beautiful forms of pattern and colour evolved, with weavers expressing their various symbols, patterns, ideas, and tribal traditions within the confines of these techniques.
A lazy line or section line is a technical feature of weaving which describes visible diagonal joins within a woven textile. It results from interlacing wefts joining adjacent warp sections woven at different times.
Diagrams courtesy of Kilim Studio