Examples
![](https://www.google.com/images/icons/product/drive-32.png)
![](https://www.google.com/images/icons/product/drive-32.png)
A single nod (man on the left)
A repeated nod (woman on the right)
![](https://www.google.com/images/icons/product/drive-32.png)
![](https://www.google.com/images/icons/product/drive-32.png)
A tilt (man on the left)
A side turn (woman on the right)
A single nod (man on the left)
A repeated nod (woman on the right)
A tilt (man on the left)
A side turn (woman on the right)