An image for brandishing every time someone tells you that the medievals believed in a flat earth.
(Apparently from a 15th cent. French ms. of Bartholmaeus Anglicus, De proprietatibus rerum [On the properties of things] first written in the 13th cent. Source: http://www.nytimes.com/2014/10/14/science/space/in-cosmigraphics-our-changing-pictures-of-space-through-time.html)
Ecclesiastical ephemera 