This is the reason that glass blowers can make the beautiful shapes that they do. It's not enough to just melt something, you have to be able to heat it so that it will maintain some tensile strength and hold its form while you shape it.
Glass is a really good example, especially when you look at the shapes that glass blowers can make when they manipulate the heated glass. It acts like a soft material, not quite liquid but not really solid either. So they can make it into bubbles and hollow shapes.