Final answer:
The subject matter is Arts, specifically related to sculptures and installations that pay homage to historical and cultural narratives, at the college level.
Step-by-step explanation:
The materials referenced in the question point towards the subject of Arts, specifically concerning various art forms and sculptures.
For instance, Nga Kina (sea urchins), which is an art installation made of fiber-glass reinforced concrete and positioned by the Kumutoto river, serves as a historical tribute to the Maori settlement.
This sculpture, which is highly visible at low tide, represents the midden or shell mounds created by the Maori from harvesting natural shell lifeforms. Similarly, Pisupo lua afe (Corned beef 2000) is an artwork that utilizes flattened corned beef tins and rivets to express cultural narratives.
In these contexts, these artworks connect to the broader discussions in not only arts and sculpture but also cultural history.