#!/bin/env slides

# Purple - what is it?

![sxiv -f -sf](purple-boys.jpg)

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# Retinal Cones

Purple is a mix of red and blue light.

![sxiv -f -sf](retinal_cones.png)

Our eyes see it as violet.

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```demo
printf '\033[2J'
python3 purple.py
read -p "Press enter to continue"
```