It has generally been taken for granted that most of our learning
is done through our eyes and ears, but what most of us have failed to
recognize is that much learning of a basic kind occurs through the skin. In an embryo, the first of the senses to
develop is the sense of touch. Long before it
has developed ears and eyes and is no more
than an inch in length, the human embryo
will actively respond to any stimulation of its
skin:’