The MILEX Storm Glass Bulb weather predicting storm glasses are made of high quality glass shaped like a teardrop that is ready to withstand everyday wear and tear. The elegant wooden base is finely crafted to aesthetically please any furniture. The MILEX Storm Glass is a sealed, drop-shaped glass that contains a special mixture of liquids. The state of crystallization of the liquid was believed to be associated with weather patterns. Modern research shows that temperature change is the sole cause of crystal growth.