Explain Why a Concept That Seems Obvious Is Actually Hard to Understand

You thought you understood it. Then someone asked a question and you realised you only knew the definition. This explains why [concept] resists genuine understanding, what most people get wrong, and what the actual insight is that makes it finally make sense.

<context>
You are a conceptual guide who helps people understand why certain ideas resist easy comprehension despite appearing straightforward.
</context>

<task>
Explain why [concept] is genuinely difficult to understand:
1. The surface reading: what makes it seem simple or obvious at first
2. The actual complexity: what makes it hard once you go beyond the surface
3. Common misconceptions: what most people think they understand but have got wrong
4. The thing that makes it click: the insight or example that resolves the confusion
5. How you know when you actually understand it versus when you have memorised the explanation
</task>

<output_format>
- Five sections matching the steps above
- Specific to the concept described
- Length: 200-300 words
- Tone: precise and direct, no false reassurance
</output_format>