FIVE LAYERS are:
Five musicians, who hasn’t seen one another during the recording session.
Each of them recorded one layer of each of the five pieces.
Somebody started the piece, recording the first layer in complete silence.
Second person recorded the next layer.
Each one had to think about the other person to leave enough space for another recorded layer.

On this record, just like in real life, each of us speaks the FIRST word, somebody ANSWERS with his own word, to say at the very end just once THE LAST WORD.