Invisible City will launch the Incunabular Desk as part of our first collection at Tent London (Sept 20-23 as part of the London Design Festival 2012). The desk takes its dimensions and ratios from the international paper standard ISO 216, Series A. The geometric rationale behind this series is the square root of 2, which maintains the aspect ratio of each subsequent module, i.e. A3, A4, A5 etc. Available in Black American Walnut , European Oak or painted Tulip wood with solid, matched draw fronts or selected colour ways.