A 9's Fan's Clock

I do not claim a copyright on the picture below. One day it arrived unsolicited in my email inbox and stayed there for a long while until rediscovered on occasion of my being overwhelmed with an email clearing zeal. The idea is not mine, by any means - of which envious. On the other hand, I thought it would be unfortunate, for a chef d'oeuvre like that to end up in a trash can of my computer. Hence, the picture:

The 1 - 12 are calculated each with three 9s (in a not unique way) as

1. (9/9)⁹
2. (9 + 9) / 9
3. √9 + 9 - 9
4. √9 + 9 / 9
5. √9! - 9 / 9
6. 9 - 9 / √9
7. 9 - √9 + .9
8. 9 - 9 / 9
9. ⁹√(9⁹)
10. 9 + 9 / 9
11. 99 / 9
12. 9 + 9 / √9