From four-dimensional hexagons to the mind-bending amplituhedron, geometrical shapes are wilder than we learn at school - and they are a crucial tool for understanding reality ...

To communicate with large numbers of students, teachers used a wide range of objects, including these models of simple geometrical shapes. Connecticut school reformer and lecturer Josiah Holbrook ...

A late 19th century New Zealand psychologist attempted to depict various states of consciousness with geometric shapes. Rachel Nuwer. November 26, 2012. Get our newsletter! Get our newsletter!

Geometric shapes appear below the Megaloceros, a giant extinct deer, in the Lascaux, France, cave paintings, which are thought to be 17,000 years old.

Holbrook's Geometrical Forms and Arithmetical Solids National Museum of American History. Click to open image viewer. CC0 Usage Conditions Apply Click for more information. Click to view download ...