Picture windows are called as such because they seamlessly frame a scene — they're just one fixed pane of glass looking outward. There are no moving parts and few, if any, dividers (grilles, muntins, rails, stiles, etc.) in the way to disrupt your view. Appropriately, picture windows are all about clarity! If there are outdoor surroundings you really want to showcase, a picture window is a great way to go about it.