This Star Wars Lightsaber Heat Changing Mug has to be seen to be believed. When cold, this mug features only the Star Wars logo and a circle of unlit lightsabers. However, as soon as you pour hot liquid into the mug all 14 lightsabers light up with the signature colors of all your favorite Star Wars characters including Darth Vader, Yoda, Luke Skywalker and Obi-Wan Kenobi. The mug works by thermochromic, which is a scientific word for magic. The force will be with you every morning when you use this mug. An incredible gift for any Star Wars fan.