Physica Curiosa is a compendium of engravings and stories based upon monsters and bizarre animals considered at the time to exist, and also physical abnormalities and deformities. The book was written by the German Jesuit, and natural philosopher (scientist) Gaspar Schott (5 February 1608 – 22 May 1666). Using his Latinized name Gaspare Schotto the book was first written in 1662. Despite huge advancements in the field of science in the seventeenth century by such figures as Isaac Newton, books about fabled creatures were extremely popular; a juxtaposition still existed between superstition and science. Alongside these new discoveries in mathematics, optics, and astronomy, there still lay in the shadows the existence of mythological creatures, demons, witches and a blending of magic and reality. Unicorns were depicted from the medieval period as symbols of purity and grace, its horn was said to have the power to cure those who have been poisoned. Narwhal horns were also frequently sold as unicorn horns.