Tempo Drop Tempo Drop Storm Glass Price: ¥4,730 BRAND: Perrocaliente SIZE: Mini Tempo Drop is based on the "Storm Glass," a weather forecasting device originating in 17th-century Europe. While the original Storm Glass was a large cylindrical device, the Tempo Drop is housed in a simple and beautiful glass container shaped like a teardrop, allowing for easy observation of the crystals at home. The glass is filled with ethanol in which camphor is dissolved. In the past, sailors used the appearance of the crystals to predict future weather and the direction of thunderstorms, but in the 21st century, it cannot be considered a realistic weather forecast. Rather, enjoy the delicate crystals that sparkle in your hand and the changing expressions of the crystals each day as an objet d'art.