Abstract: A novelty advertising system using a plurality of hollow plastic rectangular enclosures simulating stacking boxes of real products to construct an advertising display is herein disclosed. The hollow enclosures provide replaceable advertising inserts depicting the product being sold. Each enclosure is provided with a plurality of interlocking posts and sockets allowing creation of large stable displays without using large quantities of real product which cannot be sold. Such displays can be built with minimal expense while avoiding a danger of toppling displays built with the actual heavy product.