Towards the end of the 1960s, a young architect and designer rethought the folding technique of pleated lampshades with the Sinus Line series. It was Poul Christiansen who had the idea that one, in addition to folding LE KLINT's lamps in right angles, could fold pleats in waves according to mathematical sine curves.

Poul Christiansen among his Sinus lamps. The models are, from left to right: 170, 169, 171, 167, 175, 172, 179, 178, 501-1.

A new way of expression

Poul Christiansen was trained at the school of architecture at the academy of fine arts, and was fascinated by curves right from the time he took his entrance examination. Under the auspices of LE KLINT, he wanted to fold a lamp with a calm and uniform theme of folding, which would, as a finished product, be perceived as a spherical shape rather than a cylinder or cube:

[...] It was the simple sine curve that helped me. I etched the curve in a longitudinal and continuous curve with a set oscillation, followed by other longitudinal curves running in parallel, with other oscillations at a set distance to the first one. This relatively simple pattern turned out to be preserved on the SPHERE.

At which point I "only" had to do the hard work of adjusting the curves and folds with countless templates until the form was completed. And I managed to do it! A few days prior to the opening of the exhibition (the one-person exhibition "lighting sculptures" of January 1971, ed.) I had a single large sinus sphere, which was beautifully presented in the largest window facing Vesterbrogade. It was later designated 172 and in time became the most well-known and best-selling of all the "Sinuses".

- Poul Christiansen, December 2007
 

At a furniture exposition at the Bella Centre in May 2003, LE KLINT displayed a gigantic version of 172 that Poul Christiansen had folded. In the image, Poul Christiansen is shown with the 172 giant in Tokyo in 2007.

The beautiful Model 172

Model 172 is hand folded according to the principles of the mathematical sine curves, and has become one of LE KLINT's best selling lamps. The sculptural and advanced shape of the lamp makes it pretty amidst colourful decor as well as in simpler homes.
 

Model 172 - designed in 1971. 

The pear-shaped comet lamp (Model 181)

Poul Christiansen has collaborated on and designed a wide variety of models for LE KLINT. Among other things, he developed the Comet in 2003, or the Drip, as it is also called. You can spot the popular fruit lamp's cross-pleats in this model, but the classical folding technique is once again utilised in a new way, which expresses the lamp in a different way.

The Comet/The Drip was designed in 2003.