Passage Summary: Because ancient people made their hunting tools look nicer than they strictly needed to be, they must have cared about how things looked.

Conclusion: Early humans likely possessed a sense of beauty or aesthetics.

Reasoning: Ancient flint tools were polished to a degree that exceeded what was required for their functional use in hunting.

Analysis: The argument relies on the assumption that 'extra polishing' can only be explained by aesthetics. To weaken this, we need an alternative functional explanation for why someone would over-polish a flint. If the extra polishing served a practical purpose—like making the tool more durable or easier to grip—the claim about an 'aesthetic sense' becomes much less certain.