Hardangersøm is counted whitework: white thread on white even-weave linen, worked on the aprons and shirt fronts of western Norway. Thick satin kloster blocks are laid first, then warp and weft are cut and withdrawn inside them, leaving open squares rebridged with needlewoven bars.

Nothing here is coloured. The pattern is read entirely as relief — satin catching light, cut squares dropping into shade. Every dimension is a whole number of threads, so the geometry is exact before it is beautiful.