A vertical alignment liquid crystal display device includes a display panel. The shape of an interface between the liquids is changed by a voltage application, and a light transmission path, the center of which is a virtual axis passing through the end face walls in the thickness direction of the container, is formed in a portion of the second liquid. The trigger is applied to both NAND inputs and to one AND input. Two or more carts can be nested together by pushing the front wall of the basket of a first cart through the rear frame beneath the fixed child seat of a second cart, simultaneously pivoting the rear gate upwardly to allow the basket of the first cart to enter the basket of the second cart. The food supporting compartment can be moved between a first position above the fuel supporting compartment and a second position away from said fuel supporting compartment.