sixpenceee: The Lycurgus Cup is made out of a special type of glass, known as dichroic, which changes color when held up to the light. It was built in Rome in the 4th century. 

sixpenceee: The Lycurgus Cup is made out of a special type of glass, known as dichroic, which changes color when held up to the light. It was built in Rome in the 4th century. 

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from: https://itbeginswithahouse.tumblr.com/post/109321164447