I got alone inside the field finally after some months
First, I wanted to revise how the "tapes" were, and everything looked normal until I saw a way to an unknown place, so I've decided to follow the new way.
Images explain what I've found during the exploration, and for some reason, those things are hidden in the whole field when we used to think that there was only a zone with those things

Who's doing these things?
Maybe we won't be able to find the autor or at least now