Holy Pet Pyramid

108, because 108 is everything. 9, because 9 brings luck.

HOLY PET PYRAMID is an immersive light installation of nine rings, each made of 108 PET bottles and 108 LEDs. It runs on a circuit of car batteries and solar power — a circuit first put to the test for three months in the alpine climate at 2,900 metres on Piz Uter. It holds.

The bottles are collected locally and screwed onto frames built from recycled wood. Hand-sewn beanbags filled with waste invite visitors to lie beneath the pyramid and drift off into distant dreams. The parts are built participatively, together with volunteers. A ring of 108 bottles weighs about 14.3 kg; the whole pyramid around 130 kg.

Domenic Keller and Yannick Portmann have been playing with technology since primary school — and with LEDs and microcomputers since 2021.