My version of how a design for the Guild Navigator from the Dune universe could look. Originally a human whom after centuries of mutation and using their mind to find paths through space, has evolved into this creature. Their head has constantly been evolving and growing, turning the top portion of the skull from hard bone to a softer and more transparent material able to morph its shape. His face stays tucked inside his head while he rests, retracted in a similar way to how snails retract their eyeballs, until he is required to communicate with a regular human. When someone approaches to speak, his bones shift forward and muscles move into place(illustrated guide in third image) allowing for his more recognizable face to come out. They communicate through hand signals and evolved vocal chords capable to projecting sound throughout his chamber.