olemus
(5a) ruumiliste kompositsioonide kunst
(5b) selle kunstiliigi teos

Wiktionary:
installation
3. a work of installation art

Wiktionary:
installation art
a genre of art which incorporates any media, including the physical features of the site, to create a conceptual experience in a particular environment

ülevaateid
https://en.wikipedia.org/wiki/Installation_art

näiteid
https://duckduckgo.com/?q=installation+art&t=h_&iax=images&ia=images