For 21 centuries, mathematicians worried about a fundamental assumption made by Euclid of Alexandria: that parallel lines must meet at infinity.  Could geometry ‘work’ without this assumption? The answer caused mathematicians to reassess the nature of mathematics itself.

Plans and elevation: the development of architectural drawings

The Bodleian Libraries at the University of Oxford is the largest university library system in the United Kingdom. It includes the principal University library - the Bodleian Library - which has been a legal deposit library for 400 years; as well as 28 other libraries across Oxford including major research libraries and faculty, department and institute libraries. Together, the Libraries hold more than 12 million printed items, over 80,000 e-journals and outstanding special collections including rare books and manuscripts, classical papyri, maps, music, art and printed ephemera. Members of the public can explore the collections via the Bodleian’s online image portal at digital.bodleian.ox.ac.uk or by visiting the exhibition galleries in the Bodleian's Weston Library. For more information, visit www.bodleian.ox.ac.uk.