How To: Shadow Puppets Heat Changing Mug - Learn How to Create Fabulous Shadow Puppets - Comes in a Fun Gift Box This transforming mug shows you how to make 10 classic shadow puppets. When it's cold, see the shadows and when it's hot, see the hands! All you need is a campfire or a flashlight and a steamy beverage to create ten classic shadow puppets! 10 oz. ceramic mug. Comes in a colorful box. Color changing cups are microwave safe, but not dishwasher safe. Hand wash only. Don't soak. Click on "The Unemployed Philosophers Guild" above the product title to see more great gifts. UPG truly has presents of mind.