Swans Reflecting Elephants (1937) is from Dali's Paranoiac-critical period. Painted using oil on canvas, it contains one of Dali's famous double images. The double images were a major part of Dali's "paranoia-critical method," which he put forward in his 1935 essay "The Conquest of the Irrational." He explained his process as a "spontaneous method of irrational understanding based upon the interpretative critical association of delirious phenomena." Dali used this method to bring forth the hallucinatory forms, double images and visual illusions that filled his paintings during the Thirties.