Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: cool but messy

My 3 children, ages 3,4,and 6, received this as a present. The pictures turned out very cool, much neater than what you can make on your own with glue and colored sand, although it was much too difficult for any of my children to do on their own. Thank goodness we did this project outside because it was very messy, we had sand all over the place. I couldn't get the sand release button to work either, which would have enabled me to put leftover sand back in the bottle. If you don't mind participating with your children in a messy art project, you may enjoy this. We still have our very cool looking sand pictures displayed throughout our house, 6 months later.