human
How do I build a sand castle?
assistant
To build a sand castle, you will need some kind of base. This can be made from anything such as cardboard boxes or foam boards. Once the base is ready, start by adding layers of sand to it in different shapes and sizes. You can use buckets, shovels, and other tools to create the desired design. After that, add more layers of sand to fill up any gaps. Finally, you can decorate your sand castle with shells, seaweed, and other decorations.