Light! Greatest mystery, all-pervasive, elusive, invincible, all-surpassing beauty, what is it that you have unveiled of yourself? What is it that people have wormed out of you in their quest to be able to seize infinity? ‘Hail holy Light, offspring of Heav’n first-born, or of th’ Eternal Coeternal beam. May I express thee unblam’d? Since God is light, and never but in unapproached light dwelt from Eternity, dwelt then in thee, bright effluence of bright essence increate! - John Milton, Paradise Lost, Book 3