Aquest cilindre reflectant mostra correctament la imatge plana deformada.

In these examples, the façade of the Palau Mercader and the Miranda tower in Cornellà are correctly reflected in the cylinder

Anamorphisms in art

The technique of anamorphism or anamorphosis consists of deforming an image so that in order to "see" it correctly, a reflection or a certain perspective is necessary. It was practiced in the Renaissance by artists such as Hans Holbein, Leonardo da Vinci, Jacopo Vignola. 

Illustration "The Mysterious Isle" by the artist István Orosz.  Whena reflective cylinder is placed on the Sun, the image of Jules Verne is reflected.

Illustration of the book "El mundo físico" 1882. Wikipedia Source

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