One of the most famous examples of anamorphosis is hidden in a portrait by Hans Holbein. It is called TheAmbassadors and was painted in 1533. Holbein was born in Germany but lived the last part of his life in London working for King Henry VIII.
The painting shows two French ambassadors and is full of objects related to science, the arts and mathematics. Holbein painted everything accurately but a strange shape floating over the floor seems completely different. It is a type of anamorphosis known as a ‘shear transformation’, which means it has been slanted sideways. You can only see what it is meant to be by looking from the side.