While the brand of clay used by @uamaika might be difficult to find in the U.S., you can get a 2.2-lb pack of DAS Air-Hardening Modeling Clay ... or a stiff brush to make a sweeping pattern ...

Why doesn’t a heavy ship sink? Get some clay and we’ll solve this puzzle. If you make a compact ball or sausage shape out of the clay, whether large or small, it sinks to the bottom of the container.

So first we' ll need some modelling wire or pipe cleaners ... This glue is called slip clay or just slip and you make it out of old bits of clay mixed with some water. You will need to make ...