An educational toy comprising a closed container filled with a liquid having a freezing point generally below room temperature and a metal rod extending into the container and outwardly therefrom through a heat insulating material and into a second open container. Upon placing an ice cube about the end of the rod in the open container, crystallization is seen to occur about the opposite end of the rod within the closed container due to the freezing of the liquid about the rod, thereby giving the effect of transfering the ice cube from one container to the other.