Between 1969 and 1987, Poul Christiansen brought extraordinary innovation and dimension to Le Klint’s designs and to its legacy. Prior to his contributions, Le Klint shades had been folded in straight lines across pleats. Christiansen discovered that folding in mathematical curves gave the lamp shades beautiful and unique sculptural shapes. His iconic model 172 of the Sinus Line series features artfully arranged sine curves that form a wavy, spherical lampshade when folded. Poul Christiansen still creates new lamp designs for Le Klint, with recent additions such as the Elysion light sculptures and the wall lamp model 215.