Jean Piaget
Mapped how thinking grows.
A developmental psychologist who charted the stages by which children build their understanding of the world.
Intelligence is not what you know, but what you do when you don’t know.
Who they were
Jean Piaget watched children closely and discovered that they don’t think like small adults — they reason in qualitatively different ways that unfold in stages. He described how we build mental schemas and revise them as the world surprises us, through assimilation and accommodation. His work founded developmental psychology and reshaped how we teach and understand learning.
Famous books
What they left on the shelf
Terms they cared about
Ideas worth knowing
Their techniques
How the work was done
Questions in their spirit
What they’d ask you
Sit with one. Answer online, or in the app.
Carry the idea forward
Piaget — What they’d ask you
Psipas asks you one small, honest question at a time — and builds the picture from your answers.