CycleGANs were proposed by Jun-Yan Zhu, Taesung Park, Phillip Isola, and Alexei A. Efros in a paper titled Unpaired Image-to-Image Translation using Cycle-Consistent Adversarial Networks, which is available at the following link: https://arxiv.org/pdf/1703.10593. CycleGANs have some really interesting potential uses, such as converting photos to paintings and vice versa, converting a picture taken in summer to a photo taken in winter and vice versa, or converting pictures of horses to pictures of zebras and vice versa. We will learn how to turn paintings into photos using a CycleGAN in Chapter 7, CycleGAN - Turn Paintings into Photos.