The potential to expand our senses, to utilize cellular functional plasticity in order to engage in sensory substitution, organic or full body re-creation (related to cloning and regeneration done in a proper medical environment outside of the body), as well as the regrowth of severed limbs and ravaged visceral or brain components is fascinating, but largely unexplored.
Think about this: "Each of our body's individual cells carries within it the entire genetic code and blueprint for the replication of our entire body, and of any body part." This would seem to contain the subtle inference that any one cell, given the right "instructions" or "stimuli" or "environment" could grow a whole new you, or any spare parts or replacements that you might need at any given time.
We experience small hints of this potential for vast sensorial expansion, identification and cultivation of unacknowledged "sixth senses," through various experiences, exercises and scientific (principally medical) innovations. For example:
1) Intuition and instinct as intelligence beyond our conscious knowledge;
2) "Sensing" when someone is staring at you;
3) Knowing that someone has entered a room and is standing behind you, even if there were no sounds or other sensorial clues prior to or during his secretive entrance. [one theory is that your body can "feel" the displacement or compression of air molecules due to the person's presence];
4) Getting a "feeling" that someone closely connected to you yet many miles away has been hurt or killed;
5) Thinking about a particular song, and then turning on the radio only to hear that very song playing...
Most of us, during the course of our lives, have experienced more than one of the above occurrences multiple times. It may be sensory. It may be signalling or messaging. It remains a mystery, but it is a well-documented part of the Human Dance Of Life. It dates as far back as written communication, and is referenced in virtually every culture.
Many tribal rituals engaged in by the more "primitive" (a poorly judgmental term meaning "unperturbed by the distractions and preoccupations of excessive stimuli, sensorial overload and screaming technology) produce, through the integration of natural chemicals (botanicals, usually, but occasionally more refined drugs produced synthetically) have produced synesthesia, or even glimpses at other realms of existence.
Here is a thought-provoking predictive article from BigThink, an excellent, fertile source of topics for investigation for The Global Futurist Blog and The Braintenance Blog:
Hearing Through Your Skin And Other Adventures In Sensory Substitution
I believe that we are sending and receiving signals through various mechanisms that we are failing to acknowledge and failing to develop or cultivate. Perhaps these special communications are far more intimate and profound -- requiring less explanation -- than those verbal and non-verbal signals which we acknowledge so readily. And perhaps, we are more connected to each other, and to whole of us, than we even dare to think.
Douglas E. Castle