human
How can I make a sand castle that will last?
assistant
To make a sand castle that will last, you should start by choosing the right materials. You'll need a base of wet sand and then some kind of binding agent like flour or salt to hold everything together. Next, you should create an outline for your castle using sticks, stones, and other objects to give it shape. Then fill in the walls with more wet sand and smooth out any bumps or uneven surfaces. Finally, use small pieces of seaweed or shells to decorate your castle and help it stand up against the wind and waves.