Basketweave is made up from small squares and rectangles. The placement of the pieces gives the impression of strips weaving under and over each other. Many complex patterns can be achieved in weaving by passing under and over different numbers of cross pieces.
Mathematically, pieces that fit together to form a pattern are called tessellations. There is often more than one way to split a design into identical pieces. From a technical point of view it is sometimes easiest to choose the smallest possible unit. At other times using larger units can mean that there is much less sewing up to be done at the end.
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