Final answer:
Mature postmodern design in Holland and Britain is manifested in ornate, historically-referencing architecture, as well as in art that features bricolage, appropriation, and a blurring of lines between high and popular culture.
Step-by-step explanation:
The elements of mature postmodern design in works from Holland and Britain are reflected in the architecture and art of the period, which showed a departure from the minimalist tendencies of modernism towards a style characterized by ornamentation, playfulness, and historical reference. Notable postmodern buildings like the Beaubourg Center in Paris showed deconstructionist ideas and an inside-out approach that left mechanical and functional systems exposed, aligning with concepts posed by philosopher Jacques Derrida. In the realms of sculpture and art, postmodernism is recognized by its use of bricolage, collage, appropriation whereby the recycling of past styles and themes is prevalent, and the boundaries between fine arts, craft, and popular culture are dismantled. In Britain, the Young British Artists of the 1990s and figures like Jeff Koons exemplified these postmodern tendencies by elevating the mundane and employing kitsch to impart a sense of cynical ambiguity that is often associated with the postmodern approach.