I like making things and tend to work with whatever is at hand. Building sandcastles at a beach to me is a very natural thing to be doing. As a child, I saw photographs of the French ski resort of Flaine. I was very taken by the brutalist buildings, designed by Marcel Breuer. Since then I have always gone out of my way to see brutalist architecture and when I build sandcastles I have them in mind.
A five-gallon paint bucket is essential. Paint buckets are particularly rigid and have a nice sharp edge for digging with. Then it is used for carrying water. Lots and lots of water. The tools are all made of plastic. I have a couple that are nothing more than a small rectangle of 1/8-inch plastic with a beveled edge and then a couple of trowels of different sizes.