Background
Source: Wikipedia
Joseph Jastrow (January 30, 1863 – January 8, 1944) was an American psychologist who contributed to experimental psychology, design of experiments, and psychophysics. He also worked on the phenomena of optical illusions, and a number of optical illusions (notably the Jastrow illusion) that were either first reported in or popularized by his work. Jastrow believed that everyone had their own, often incorrect, preconceptions about psychology.
