The base of a diorama can be one of the most important elements in the overall appeal of the display. The selection of materials to make that base is among the more critical decisions when planning a diorama. Virtually any material can be used for a diorama base as long as it is water resistant. Blue extruded polystyrene insulation board, also known as marine styrofoam, is sold in different thicknesses and makes for an excellent material to use as a diorama base. It can easily be cut with a jig saw. sanded, shaped with a soldering iron or hot knife, and painted with water based paints. For larger bases, a good quality plywood edged with picture frame stock works fine, but needs to be sealed with a water resistant primer or varnish to prevent warping. Some of the smaller ready-made bases sold in craft stores work well also. Whatever material you finally decide on for your diorama base, remember that nothing is more unpleasant than a great diorama on a poor base. In this article we hope that we can help to guide you through the maze of tools, materials, and products that will bring you success and satisfaction when you embark on the complicated journey of diorama building.