The Semi pendant was designed in 1968 by Claus Bonderup and Torsten Thorup, two architecture students, who wanted to create a lamp with clean, charp lines and a geometric shape, as a reaction against the 'cosy era' that was dominating Denmark at the time. Their design was submitted at the Royal Danish Academy of Fine Arts School of Architecture for a competition and won first prize.

Semi is a pendant lamp based on two quarter-circles put together, back-to-back. With its its distinctive arch-shaped, enamelled metal shade, lightness of form and unique, timeless design, the elegant Semi lamp achieved great success in the 1980's and became, at that time, the best-selling Danish design, gaining worldwide recognition and iconic status.