This art glass mushroom is 4-inches across the top and stands about 3-inches tall. It's beautiful in natural light - the glass is green and it has spots on the top that are greenish-yellow.
The base is wide - about 2-inches across. But the magic happens when you put a UV or black light on this glass. More colors show up in different areas and they glow from white to yellow to orange and red. They show up in places where there are no yellow spots under natural light.
The main picture shows the top under natural light on the left and under a black light on the right. It's a great show piece from the mid-century.