The artist calls this 2001 work ‘Cape Cod Chandelier’. She goes on to say:

I like to surprise people with their reactions to these chandeliers. under-trousers cover the exits for the body’s garbage, so seeing them placed centrally in a room, giving off light, causes some people to think, ugh! that’s underwear! but others find underwear sexy. the chandeliers bridge the contradictions between the things we ignore and the things we long for, the places we come from and want to go back into.

(Source: pipilotti rist: the tender room).

In case it’s not obvious from the above, the entire piece is made from underwear.