Imagine the mind as a movement of information through the nervous system. See all the electrical signals running back and forth through the nerve cells. Around a hundred billion nerve cells traverse the human brain. Each of them making contact with up to a thousand others. However, nerve cells never touch each other; they always remain separated by a tiny gap.Chemical messengers, known as neurotransmitters, bridge this gap and thus transmit signals from one nerve cell to the next.In Sagacity neurotransmitters are depicted in a unique way: Applied on the light-sensitive side of a developped photographic negative and enlarged in a darkroom, their photo-chemical portraits appear as crystals.