Finnish New Year’s Eve fortune-telling traditionally melts tin and pours it into cold water to create a shape interpreted as a prediction.
The practice is commonly called molybdomancy, a form of divination based on the shape of cooled metal. Participants study the resulting lump and may interpret it as an object, animal, or symbol connected with the coming year. A shadow cast by the shape can also be used in interpretations.
The custom was historically performed with small horseshoe-shaped pieces of tin. Because molten metal is dangerous, the activity requires care and is increasingly subject to safety concerns. In modern Finland, safer substitutes may be used, and environmental rules have affected the materials sold for the tradition.
This is a symbolic New Year game rather than a scientifically validated method of forecasting. Its appeal comes from combining a visual surprise with family celebration and hopes for the year ahead.