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!