There seems to be a transparent liquid skimming and floating above a silver background. Is this due to the strongly concave meniscus of liquid gallium? I do not think I ever saw this, by contrast, with mercury, which has a strongly convex meniscus. And once melted, gallium may remain liquid, superfluid, for many hours, even if the room temperature is well below its melting point. The liquid may form a skin, wrinkled with fine lines, and when it finally solidifies, it may do so in shallow quadrangular prisms and zigzags like medieval fortifications.