Professor Sir Michael Berry is one of the world's leading theoretical physicists with a special interest in light.
He's been in the country to deliver a lecture titled "The Physics of Light in Eighty Pictures", where he unveiled the hidden geometries behind rainbows, twinkling stars and sunlight reflections.
Later today, he will deliver a lecture on Geometrical optics illusions to staff and students at the University of Auckland. But first, he gives Jesse the lowdown.