An upright space-dividing panel which mounts thereon a cushion usable as a back rest. The cushion is secured to the panel by at least one strap which is secured to the panel and overlies a side face thereof in a generally vertical orientation. The cushion includes a mounting arrangement on the rear side thereof which cooperatively engages with the strap to permit vertical sliding movement of the cushion relative to the panel so as to define a back rest which is usable in conjunction with a furniture component disposed adjacent the panel and defining a seating surface thereon.