"The Waorani [people]...were not peacefully contacted until 1958, though their homeland is scarcely 150 kms from Quito, the national capital of Ecuador and a city settled for well over 400 years. In 1957, five missionaries attempted to contact the Waorani and made a critical mistake. They dropped from the air eight-by-ten glossy black-and-white photographs of themselves in what we would describe as friendly gestures, forgetting that the people of the forest had never seen anything two-dimensional in their lives. The Waorani picked up the prints from the forest floor and looked behind the faces to try to find the figure. Seeing nothing, they concluded that these were calling cards from the devil, and when the missionaries arrived they promptly speared them to death."
-Wade Davis, The Wayfinders
Sources: https://old.reddit.com/r/DilettanteryPodcast/comments/nkmd27/121_the_four_dimensions_of_reality_and_the_two/?