Jean Dubuffet
Jardin de Bibi Trompette (Bibi Trompette's Garden), 1955
The Stephen Hahn Family Collection (Partial and Promised Gift)

at the National Gallery of Art

Article at the Hirshhorn Educational site.

A what? An assemblage is a three-dimensional artistic composition made of miscellaneous objects or found materials.

The French artist Jean Dubuffet first used the term assemblage to describe a method of turning found objects into three-dimensional structures.

The debate about what is a collage versus an assemblage also began at that time. Dubuffet referred to his butterfly works as assemblages, though art historians seem to prefer the term collage.