Fairy Tale Window Mosaic. Mosaic making has never been so easy. No glue is needed and it's not sticky either. The innovative easy-to-stick mosaic pieced will stay on most shinny surfaces like magic. Simply follow the design template provided and make a colorful mosaic picture to hang on your window. Let the sun shine through and turn your window into a world of vibrant colors. It's and easy-to-do. Ages 7+. Finish size 10.23"x10.23"