My Wife and My Mother-in-Law
American cartoonist William Ely Hill (1887–1962) published "My Wife and My Mother-in-Law" in Puck, an American humour magazine, on 6 November 1915, with the caption "They are both in this picture — Find them". However, the oldest known form of this image is an 1888 German postcard.
- "My wife and my mother-in-law. They are both in this picture – find them". Prints & Photographs Online Catalog. Library of Congress. Retrieved 9 October 2011.
- Weisstein, Eric W. "Young Girl-Old Woman Illusion". MathWorld. Retrieved 9 October 2011.
- Botwinick, Jack (June 1961). "Husband and Father-in-Law—A Reversible Figure". The American Journal of Psychology. 74 (2). doi:10.2307/1419424.
- Nicholls, Mike; Churches, Owen; Loetscher, Tobias (23 August 2018). "Perception of an ambiguous figure is affected by own-age social biases". Scientific Reports. 8 (1). doi:10.1038/s41598-018-31129-7. PMC 6107502.
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