The Mandala Flower Board has Lucite in what were the openings, so there's a base and nothing will fall trough. The boards are not suitable for wet play but can be used on the light table and outside in nature. Find little treasure to put on the board and enjoy the beautiful Mandala that has been created. These large Flower Boards have coloured Lucite and look fantastic up against a window when not used for play. Also really nice on the light table.