Wren, Hooke and Willis: Divine geometry and natural design The status of geometry with respect to the natural world...
Indra’s Pearls: Geometry and Symmetry An explanation of the first computer exploration of Felix Klein's vision of fractals in the 1980s, and what mathematics has gained by it.
Mathematics, Motion, and Truth: The Earth goes round the Sun The reality of the Earth's motion, as proclaimed by Copernicus...