Horizontal and vertical décalage  

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Kunstformen der Natur (1904) by Ernst Haeckel
Kunstformen der Natur (1904) by Ernst Haeckel

Horizontal and vertical décalage are terms coined by developmental psychologist Jean Piaget. He is credited with delineating Piaget's stages of cognitive development: sensorimotor, preoperational, concrete operations, and formal operations.

Unless indicated otherwise, the text in this article is either based on Wikipedia article "Horizontal and vertical décalage" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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