Final answer:
The subject of this question is Art. Artists have used different mediums such as paintings, sculptures, and poetry to express their ideas and emotions about the impact of machines and the industrial world.
Step-by-step explanation:
The subject of this question is Art. The question refers to various artworks and sculptures that are related to the theme of machines and industrialization. Artists have used different mediums such as paintings, sculptures, and poetry to express their ideas and emotions about the impact of machines and the industrial world.