Anyone can learn to count in the ordinals, even a child, and so let us learn how to count to $\omega^2$, the first compound limit ordinal.
The large-format poster is available:
![](http://jdh.hamkins.org/wp-content/uploads/Omega-squared-poster-720x1024.jpg)
Some close-up views:
I would like to thank the many people who had made helpful suggestions concerning my poster, including Andrej Bauer and especially Saul Schleimer, who offered many detailed suggestions.