coolartefact: Roman Lycurgus Cup is a 1,600-year-old jade green Roman chalice. When you put a source of the light inside it it magically changes colour. It appears jade green when lit from the front but blood-red when lit from behind or inside. (GIF)
![Coolartefact: L'atleta Di Fano [Athlete Of Fano], Statue Of A Victorious Youth -](https://64.media.tumblr.com/1b13d302feb22178c8b8d05b9411bc30/tumblr_o7sci7ooJf1ukgx4io1_250.jpg)
