tied overshot (star-and-diamond weave)

a supplementary-weft unit weave with two tie-down ends and a plain weave ground cloth. Each threading unit contains two half-units (even-tied overshot with an even number of ends in the half-unit and uneven-tied overshot with an uneven number of ends). In the pattern area the supplementary weft floats over one half-unit and weaves tabby (halftone) in the other. In the background area the supplementary weft floats under a half-unit and weaves tabby (halftone) in the other. Each half-unit of treadling reverses the halftone/float position of the preceding half-unit. The ratio of tie-down ends to pattern ends is 1:1; there are at least six ends in a unit; one of the tie-down ends alternates in the first half-unit and the second tie-down end alternates in the second half-unit; one tie-down end is lifted for one half-unit of treadling, the other for the next half-unit of treadling. One structural unit usually contains two blocks A: 3-1-3-1-3; B: 4-2-4-2-4; blocks are usually threaded in point or straight order.