El Matador State Beach, Malibu, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3288945/free-photo-image-beach-cave-cc0Free Image from public domain licenseAmphitheatrum sapientiae aeternae solius verae, Christiano-Kabalisticum, divino-magicum, nec non physico-chymicum… https://www.rawpixel.com/image/14009883/image-paper-book-black-backgroundFree Image from public domain license