bregma:

A Helium-filled Kinetic Drawing Sculpture by Karina Smigla-Bobinski
The installation is made form an enormous helium-inflated sphere trapped inside a small room that’s spiked with dozens of protruding charcoal pieces which scrape the edges of the gallery wall as participants push, toss, and otherwise manipulate it. 
source

bregma:

A Helium-filled Kinetic Drawing Sculpture by Karina Smigla-Bobinski

The installation is made form an enormous helium-inflated sphere trapped inside a small room that’s spiked with dozens of protruding charcoal pieces which scrape the edges of the gallery wall as participants push, toss, and otherwise manipulate it. 

source