A self-illuminating video screen system employing a concave display surface which provides for enhanced depth cueing. The invention is also directed to the aforesaid sulfur-carbon composite as a layer on a current collector material; a lithium ion battery containing the sulfur-carbon composite in a cathode therein; as well as a method for preparing the sulfur-composite material. An active bed, such as a bed of catalytic elements, may be supported by the support bed. The valve seat member includes a first pressure responsive surface adjacent to the orifice and a second pressure responsive surface substantially opposed to the first pressure responsive surface. In the case that an update frequency is fast enough, a search for resources is realized by one lookup. A grapple member is slidable mounted on the mandrel above the activator ring; the grapple member has an enlarged diameter plate, which rests on an upper edge of a severed casing.