human
Is there a way to make a sand castle stand up?
assistant
Yes, you can use wet sand and water. Start with the base of your sand castle and build it up using wet sand. Make sure to keep adding layers until the entire castle is built. Once the walls are stable, fill in any gaps between them with more wet sand. Finally, pour water over the top of the castle so that it will be heavier than the surrounding sand and therefore remain upright.