1 February 2026
Perfect numbers and aesthetics
February has $28$ days, and $28$ is the second perfect number, so let’s start there.
31 December 2025
A correspondent with a bookbinding hobby emailed to say that they had printed and hand-bound the entire work.
3 October 2025
Rhombic polyhedra in the work of Kepler
For the Mathober 2025 day 2 prompt ‘Polyhedron’, an outline of a lesser-known use of polyhedra in Kepler’s work.
1 October 2025
Geometrical mosaic from the Alhambra
For the Mathober 2025 day 1 prompt ‘Link’, an image based on a geometrical mosaic from the Alhambra.