When Magic Eye Pictures Ruled the World—and Frustrated Millions of People

 https://www.mentalfloss.com/article/622658/when-magic-eye-pictures-ruled-world?utm_source=facebook.com&utm_medium=atlas_obscura&fbclid=IwAR38Ulzf1MTZUDp0lqsMaYWmYREFAOGiv7x7I2eZQbu0dq4o2EaZS69zJB8