At over 100 years old ‘The Vanity’ has stood the test of time as being one of the finest Optical Illusions ever created. It was painted by Charles Allan Gilbert who was an American Illustrator between 1873 - 1929.
As you study the picture the two objects should become much clearer & you should be able to identify between them quite quickly.

You should either see a beautiful woman sitting down looking into a vanity mirror, or a large human skull with her vanity items make up the teeth & the jaw of the Skull.

An image similar to this painting was used by Def Leppard for their album RetroActive in 1993