Physiognomy (from Greek φύσις (physis) 'nature' and γνώμων (gnomon) 'judge, interpreter') or face reading is the practice of assessing a person's character or personality from their outer appearance—especially the face. The term can also refer to the general appearance of a person, object, or terrain without reference to its implied characteristics—as in the physiognomy of an individual plant (see plant life-form) or of a plant community (see vegetation).
Physiognomy as a practice meets the contemporary definition of pseudoscience[1][2][3] and is regarded as such by academics because of its unsupported claims; popular belief in the practice of physiognomy is nonetheless still widespread and modern advances in artificial intelligence have sparked renewed interest in the field of study. The practice was well-accepted by ancient Greek philosophers, but fell into disrepute in the 16th century while practised by vagabonds and mountebanks. It revived and was popularised by Johann Kaspar Lavater, before falling from favour in the late 19th century.[4] Physiognomy in the 19th century is particularly noted as a basis for scientific racism.[5] Physiognomy as it is understood today is a subject of renewed scientific interest, especially as it relates to machine learning and facial recognition technology.[6][7][8] The main interest for scientists today are the risks, including privacy concerns, of physiognomy in the context of facial recognition algorithms.
Physiognomy is sometimes referred to as anthroposcopy, a term originating in the 19th century.[9]
Although we bracket physiognomy with Mesmerism as discredited or laughable belief, many eighteenth-century writers referred to it as a useful science with a long history ... Although many modern historians belittle physiognomy as a pseudoscience, at the end of the eighteenth century, it was not merely a popular fad, but also the subject of intense academic debate about the promises it held for progress.