the late 1800s. It was widely applied to traditional kōshi doors, without much change to the traditional form and structure. The oiled paper in ama-shōji was also replaced with glass. Yukimi shoji (, snow-watching shoji) have a larger full-width section of glass, at seated-eye level, affording a view of the outside in cold weather. Glass can be used in large sheets or in small panes (the kumiko becoming muntins). Yukimi shoji also contain non-transparent translucent sections, for privacy. In suriage shoji, there is a vertically-sliding translucent section; the translucent sections are divided horizontally like a sash windows. When closed, these then look much like standard shoji (see images). Peel-and-stick films that give glass some of the appearance of washi are also sold. Sukimi shoji (, moon-watching shoji) are similar; they have upper panels that give a view, while the lower ones are translucent. Fitting Shoji doors are often designed to slide open, (and thus conserve space that would be required by a swinging door); they may also be hung or fixed. Most commonly, a shoji panel slides in a grooved wooden track. The upper groove is substantially deeper than the lower groove. The lower groove is cut in the shikii, or threshold beam ("the shikii is high" means "it is difficult to visit the place", or expresses self-consciousness). The upper groove is cut in the kamoi, a lintel between adjacent posts. The traditional wooden track requires precise fitting, and the wood may wear with use, or warp due to changes in humidity. A well-made traditional groove system is light enough that the door can be slid with one finger. Traditionally, grooves were waxed; more modernly, grooves may be lined with low-friction plastic. Shoji are often mounted in pairs, with two panels and two grooves in each opening. When closed, adjacent sliding shoji overlap by the width of the wooden frame edge. Shoji are also mounted four panels to the opening. In this case, the innermost pair are generally mounted on the same track, and the outermost pair on a different track; A rounded tongue and groove are cut so that the innermost pair interlock. The double parallel grooves allow the shoji to be slid so that they occupy nearly half of their closed width; if a larger opening is needed, the shoji must be removed. As the panels are usually slightly different, it is important to put them back in