Abstract: A window blind slat having a longitudinal axis includes a number of substantially flat, rigid, vertically extending slat sections, including at least a top slat section and a bottom slat section, each having a vertical, substantially planar face, an upper end and a lower end and means hinging the lower end of one slat section to the adjacent upper end of the next lower slat section, the sections being disposed to one another such that the tendency of the slat to vary so as to distant the longitudinal axis of the slat will be rendered incapable of esthetically or functionally interfering with the performance of the slat.