My floating clay looks like a small boat shape with sides lifted up.This shape lets it trap air and spread its weight, so the water can hold it up.Some designs sank because they were too solid and heavy in the middle and didn’t spread out the weight.It’s important to observe carefully so you know which shapes float well and which do not, so you can improve the design.You can use aluminum foil, plastic bottles, or light wood to make floating shapes that can hold paper clips without sinking.