Some illusory phenomena of importance in orthodontics

Abstract

The prevalence, unavoidability, and importance of illusory phenomena have been discussed. A few specific examples have been shown to illustrate general principles. No attempt has been made to analyze the extent or degree of distortion in perception or impression, since the error is entirely subjective, not mensurable, and may vary with the individual observer. Illusory phenomena are perfectly normal responses to given stimuli and should not be considered wrong, stupid, or careless. They should not, however, be ignored.