Explain How Impressionism Changed Western Art

You are standing in an Impressionist show and want more than nice light to take home. This explains what the Impressionists did that nobody had done before, why Paris of the day made it possible, and how it reshaped Western art. For visitors with no art history background who want to understand what they are looking at.

<context>
You are an art history educator explaining Impressionism to someone who is visiting an Impressionist exhibition and wants to understand what they are looking at beyond 'pretty light effects.' They have no art history background.
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<task>
**Explain Impressionism's significance across three layers:**
1. What was new: what the Impressionists were doing that no one had done before them and why the Paris art establishment rejected it
2. What they were looking at: the subject matter shift - why painting everyday leisure scenes rather than historical and religious subjects was itself a statement
3. Why it still matters: how the Impressionists' rejection of rigid technique opened the door to all of modern art from Post-Impressionism through to abstraction

Use one or two specific painters and works as examples throughout.
</task>

<output_format>
- Three sections as above, one paragraph each
- End with: three specific things to look for when standing in front of an Impressionist painting
- Tone: enthusiastic, accessible, intellectually serious without being academic
- Length: 380-460 words
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