On the divided line from Plato’s Republic
      A proof that the middle segments are always equal, in the style of Euclid.

Fejér’s proof of a minimum property of the orthic triangle
      A visual proof, intended for non-mathematicians.

Errata for Weyl’s Symmetry
      A guide for Weyl’s magnificent book.

Review of Monge’s Géométrie descriptiveGauss
      A magisterial discussion of geometry.

On the analog of crystallographic symmetry in the planePólya
      Pólya’s lively 1924 article on the classification of wallpaper groups.

World record surfaces: algebraic surfaces with many singularitiesLabs
      A semi-popular expository article with very many pictures.