The lamps design uses a cutting tecnique that enables to curve a sheet of plywood using a cutting pattern.

 

It uses only wood joints, no screws or glue, except for the lamp fixing.

 

The geometry on the plywood is cut using a laser cutter.

 

There are lot's of patterns available online. You can download these here:
http://www.instructables.com/id/Curved-laser-bent-wood