Final answer:
In philosophical discussions about proxy relationships, two subjects are identified: the mental and the material, which are thought to interact causally despite their different natures. Similarities and differences are based on their capacity to affect each other and their ontological classifications. A topic sentence for such a discussion could address the interplay between these two realms.
Step-by-step explanation:
The two kinds of subjects regarding proxy relationships appear to be differentiated by the qualities they embody or represent. These relationships often highlight contrasting pairs, such as male versus female, married versus unmarried, or belonging versus not belonging. These contrasts can be seen as emphasizing aspects of sex, family, and legitimacy. When discussing proxy relationships within philosophical contexts, we can consider the two kinds of subjects as the mental and the material. According to dualistic perspectives, these are two distinct classes of substances that can interact with one another causally.
Similarity(-ies) between the mental and the material include their ability to have causal effects on one another despite belonging to different classes of substances. The difference(s) lie in their nature. The mental is intangible and relates to mind, thoughts, and consciousness, whereas the material is tangible and relates to physical objects and phenomena.
A working topic sentence for Structure #2 could be: In exploring the complex dynamics of proxy relationships, we uncover the profound ways in which the mental and material realms influence and shape each other.