The Cups and Balls is a classic of magic where balls mysteriously appear and vanish beneath cups (usually three) often with unexpected objects appearing at the end. It is generally considered to be one of the oldest sleight of hand tricks but is still popular today and regularly performed by street artistes in Covent Garden.
This particular set of cups and balls was owned by the then Prince Charles, possibly our most famous member. He used them during his 1975 audition to join The Magic Circle where his performance resulted, perhaps unsurprisingly, in his appointment. King Charles, born 1948, is an Honorary Life Member and Member of the Inner Magic Circle.