Walking Chair developed between 2006–2007 the so called PET Light Family. The first and original system to make the planet’s cutest hanging lamp with your own plastic (PET) bottles. The PET Light #33 is a hanging lamp and light structure in once, created from 33 recycled and hand–shaped PET bottles, which twinkle like stars.

The PET Light Tree is the big brother of the lamps, composed of more than 198 recyclable PET bottles which are mounted on tree-shaped framework.

An absolutely highlight was a compilation of PET Light Trees named the new "amber room" designed for an exhibition DMY 2008 in Berlin. It was designed with more than 4000 recyclable PET bottles and gained a lot of positive feedback from the press and the festival visitors.