In these challenging times mankind is living through,
men wonder more and more about signs in the sky (UFOs),
messages in fields (crop circles)
and more manifestations from non-human contacts.
We are hence faced with such basic questions as:
who are these intelligent entities contacting men through all this?
And what could their intentions be?
A large spirit of openness is necessary to enter theses pages because the proposed responses to questions about nature and origin of UFOs and crop circles type phenomena can surprise readers who discover them for the first time. In this case, it is suggested to consider these responses as assumptions, justified by the profound coherence about the interpretation of these phenomena, that they can check against their own experiences and their own knowledge.