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Vase with hidden Royal faces marks the Queen's Diamond Jubilee in Edinburgh

image captionThe vase was created to commemorate The Queen's Silver Jubilee in 1977

A special vase containing the hidden silhouette of the profiles of Queen Elizabeth II and Prince Philip has gone on display in Edinburgh.

Visitors to the Camera Obscura and World of Illusions will now be able to see the Rubins Vase.

The vase was created to commemorate The Queen's Silver Jubilee in 1977.

The vase has been mounted on a moving turntable, creating the illusion of the faces swapping places and talking to each other.

Extremely rare

Andrew Johnson, director and manager of the Camera Obscura and World of Illusions, said: "We are thrilled to celebrate The Queen's Diamond Jubilee with this highly unusual exhibit.

"This Rubins Vase is extremely rare and is one of the best examples of its kind. Most Rubins vases have only one hidden face, whereas this vase has two.

"We thought it was the perfect way to mark The Queen's Diamond Jubilee and give our visitors a chance to see The Queen and Price Philip in a whole new light."

The visual phenomenon is named after a Danish psychologist, Edgar Rubin, who discovered the illusion in 1915.

He discovered the eye is unable to process two images at once but is capable of shifting between looking at the body of the vase and seeing the profile of the two heads in the silhouette.