“Stranded Aliens” by Urs Twellmann. Photo: Elizabeth Olivier Kahlau

"Stranded Aliens" by Urs Twellmann. Photo: Elizabeth Olivier Kahlau

Urs, a master with a chainsaw, cut a felled Bluegum tree into 70 discs, which he then hollowed out to make containers for reflections and textures in different bodies of water.