The elements for Iron Photographer 20:
1 - one to five stones
2 - something green
3 - sunlight
I don't think anybody will need to have the first element, one to five stones, defined. I hope the second element, something green, is equally self-explanatory. The final element, sunlight is the simplest of all.
The only question I can anticipate for IP20 is whether or not one (or more) of the stones can also be the green element. The answer to that is sure, why not?
Participating in this Utata project is simple! You need to do/have the following three things and then all you have to do is tag your photos utata:project=ip20 (read about other tagging options) and you're all set! Have fun!