Answer to Question 1
Answer: He uses discarded aluminum caps and seals from liquor bottles that he flattens and shapes.
Answer to Question 2
Answer: The ideal answer should include:
1. Walker uses gigantic scale to parody the carved sugar centerpieces on upper-class tables, including those of plantation owners.
2. Sugar becomes white when it is refined, and Kara coats this sculpture with refined sugar to allude to the pressure placed on former slaves to integrate into American society.
3. By making the sculpture large and shaped like a sphinx, Walker draws attention to the magnitude of the sociopolitical crisis that was slavery.
4. By making gigantic what might be considered merely sweet, Walker underscores the human cost of the sugar industry.