A very special piece of glass can be found at the British Museum in London. Forged into a chalice in the fourth century, it depicts the mythological King Lycurgus being trapped by a vine after he attacked the god Dionysus. What sets this cup apart from other ancient artefacts is the way it interacts with light — in ambient light it is jade in colour, but when light shines through it, it glows bright red.
RYAN MCCARRON, KING'S COLLEGE LONDON
