Around 1508, Leonardo DaVinci observed a curious image of the sun formed by a floating
bubble. Now, some 500 years later, we give a full picture of the surprisingly rich …

In 1604 Johannes Kepler published a treatise with the unprepossessing title,“A Supplement
to Witelo”(Ad Vitellionem Paralipomena). The titular “Witelo” was representative of a group of …

This paper aims to develop an understanding of a peculiar hourglass-shaped caustic that
can be observed if a partially filled wine glass is illuminated by parallel light. The light …

This historical paper examines a pioneering theory of speech production and perception
from the thirteenth century. Robert Grosseteste (c. 1175—1253) was a celebrated medieval …

Abstract Robert Grosseteste (ca. 1170-1253) was one of the first scholars to embed the
newly rediscovered ideas of Aristotle into medieval natural philosophy. In a series of short …

We describe a three-dimensional halo demonstration experiment. A volumetric arrangement
of crystals is used to project a mosaic halo display upon illumination. The demonstration can …