This is an inexpensive shadow box, take the shelve out of a bookcase. if you don't have one Walmart and others sell them cheap, you have to put them together. buy black form board 20"x30" Put in the bottom piece first then the sides , then the top (rest it on the sides) tape the whole thing together. cut a hole in the top for the light, and your done. you can make it any size you want. the one I have is 28" wide by 20" high by 18" deep.