I'm living in an idea
An idea from another mans mind
Here, we see Frank feels imprisoned by some sort of ideal. The “Idea” could refer to our capitalist consumer society. Frank is trapped in this society where creativity is unnaturally forced and would much rather “Live outside”.
It is significant that Frank makes clear that it is an idea from another mans “mind” because it not only reflects capitalism (being made to work for another man) but also that again, he is restrained and trapped by public opinion.
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