Era of the Exploration (1600-1700) Robert Hooke (1635-1703) Willen Church The only building in existence that Robert Hooke designed and that is in original condition. Hooke memorial window,St.Helen's, Bishopsgate,City of London. Cnapter 1.Era of the Exploration (1600－1700) Robert Hooke (1635-1703) Chapter 1.1 9 Hooke memorial window, St. Helen's, Bishopsgate, City of London. Willen Church The only building in existence that Robert Hooke designed and that is in original condition