part seems larger). The illusion is named after German physicists JohannJosephOppel [de] (first mentioned this phenomenon in 1860) and August Kundt (first
Orbison in 1939. Oppel-Kundt illusion The Oppel-Kundt illusion is an optical illusion named after German physicists JohannJosephOppel [de] (first mentioned
Martin Eisentraut [de] Johann Friedrich von Eschscholtz Alberto R. Estrada [fr] Susan E. Evans Eduard Friedrich Eversmann Joseph Fortuné Théodore Eydoux
teachers including Johann Nepomuk Fuchs. Wilhelm Furtwangler Anthony van Hoboken Oswald Jonas Paul von Klenau Franz Mittler Reinhard Oppel Felix Salzer [pupils]