A plant stand positioning plant pots in a cascading arrangement. The hook-like tabs are shaped so as to produce a cam effect as the tabs slide under a portion of the first member such that the further the two members are slid together, the more tightly the two members are secured together. The organic light-emitting element includes an anode substrate, an organic functional layer and a cathode. Thereby, the working distance is increased, and the assembling process of the OSA module is simplified. A method of use is also provided. The container closure includes a sealing member forming a substantially fluid-tight seal between the container closure and the body, and a dispensing member in fluid communication with the chamber.