So that's the idea: to make you a mystery.
Everyone who wants to participate can. But there are a few things for you to consider:
Well the book is centred on men, so obviously you should be either male or at least still feel related in a way…
You must be at least 18 years old.
For the final photo I need to travel to your place. So for now participation is only possible if you live in Europe and preferably not super far away from Austria. But I travel a lot and there is always a chance I might be able to come to your town. We will try to find a way.