I purchased this box at Michaels craft store for $1. I had some pink sand and glitter in my craft collection and used it to fill the box. The outcome was a great sensory learning activity for my toddler. We practice learning letters, numbers, and shapes with this box. For younger children, you could write in the sand yourself and have the child trace over it with their finger or a paintbrush and have them say what they wrote. The next step would be to have your child practice writing on their own. A great strategy would be to focus on one letter, number, or shape each week. To assist the child to work independently, a flashcard with a letter, number, or shape (or simply a post-it) attached to the inside top of the box would be another great way to practice. The way the light hits the glitter makes this such an exciting activity when the box is presented to the child too! Have fun learning!