Passage Summary: Our brains cannot hold a perfect map of the world because the world is way too big and complicated to fit inside a smaller, simpler organ.

Conclusion: Human mental representations of the external world are necessarily incomplete and lacking in detail.

Reasoning: The external world is far more complex and vast than the human brain, and it is impossible for any object to fully represent something more complex than itself.

Analysis: The conclusion is found in the second sentence, signaled by the premise indicator 'After all' that follows it. The first sentence introduces the topic, while the final sentence provides the logical justification for why the representation must be limited. When identifying the conclusion, always look for the statement that is being supported by the other claims rather than the one providing the evidence.