Horizontally oriented window blinds and shades operate up and down instead of side to side. Many types of window treatments have a horizontal orientation and include wood blinds, faux wood blinds, and aluminum mini blinds since these all have horizontal slats. In fact, these are often called "horizontal blinds" to refer to this style of blind, regardless of material. But the reference for horizontal orientation especially distinguishes shades that are also available in some type of vertical orientation - these include cellular shades and sheer shadings (sometimes called sheer horizontal shades) since there are versions of these window treatments that operate vertically. Having both styles provides an option to have coordinating treatments in all the windows in your home, even on large patio doors.