"Ephemeral materials" refer to objects or substances that are temporary or short-lived in nature. These are things that are not meant to last for a long time and are easily disposed of or decayed. Full definition
Instead, the pieces in this exhibition use ephemeral materials to define spaces for the viewer that invite open - ended contemplation. (arthaps.com)
Artists began actively participating in the creation of ephemeral materials including gallery invitations, brochures, and advertising traditionally made by a designer with limited artist's input. (tang.skidmore.edu)
While these sculptures were solid and dense, he also made works from ephemeral materials with collaborators, creating immersive environments that lasted for the duration of the exhibition. (dailyserving.com)