Abstract: An article can comprise a backing and a plurality of yarns tufted, knitted, or woven through the backing, each yarn defining at least one aesthetic characteristic. The at least one aesthetic characteristic can comprise luster, color, size, physical attribute associated with material type, or texture. At least one yarn of the plurality of yarns can comprise an engineered yarn structure having a first yarn section and a second yarn section. The engineered yarn structure can comprise a transition junction comprises commingled portions of the first and second yarn sections. The transition junction can have a length of less than 1 millimeter. The first section can have a first type of a first aesthetic characteristic of the at least one aesthetic characteristic, and the second section can have a second type of the first aesthetic characteristic that is different from the first type.