With Mercury in Pisces, you understand life through the imagination, music, poetry, and visual arts. This energy of yours is best expressed when you are communicating in a creative, intuitive, and sensitive way. You have an instinctive receptivity to others’ feelings and the wealth of collective experience ruled by this sign. The larger unconscious is like the great sea of all thoughts and feelings and you have a direct line. Because of your submergence in the subconscious, you often perceive things that others cannot and are better communicating with images due to your great sensitivity to color and sound, which helps to convey what needs to be communicated. Your immense imagination is put to good use and harnessed through the articulation of the invisible realm, psychology, art, symbols, and other imaginative forms.
Mercury in the sign of the Fishes has sensitive perceptions and is in touch with other realms. Due to this placement, you are quite psychic, telepathic, and open to spiritual messages. There is a marked capacity for knowing what others are thinking and feeling because of this connection to the wider emotional realm. The downside of this ability is that it is hard to distinguish between your own thoughts and from those around you. Pisces is also the ruler of hypnotism and subtle communication of images and words that can enter our minds without conscious control, and so you can be highly suggestible. You can be found drifting in and out of conversations and books; you’re quite the chameleon, changing your viewpoints according to the last piece of information that was received. Like a convex (or fish-eye) mirror which reflects a much larger field of imagery, you also possess this broader perception of things.
Mercury in the sign of Pisces indicates a vivid imagination and photographic ability to visualize thoughts and memories. People with this position are highly intuitive and telepathic on the unconscious level; they are, therefore, easily influenced in their thinking by subliminal suggestion, as they tune in unconsciously to the thoughts and moods of those around them. They arrive at conclusions not through logical reasoning but rather on the basis of intuitive perceptions that float up from the unconscious mind. They learn more from osmosis than disciplined study. The Astrologer’s Handbook (HarperResource Book)
You may also find that your opinions and ideas emerge from the unconscious, and you see intuitive images rather than logical interpretations. And there is difficulty knowing where this knowledge originates, but this does not impair intelligence and it only suggests that your mind resists pure rational explanations and receives information from ‘somewhere else.’ You may also talk and listen compassionately, always lending a sympathetic ear with acceptance and without judgment, demonstrating a great wave of understanding. However, the ability to communicate clearly may become muddled, and the day-to-day functioning of life doesn’t interest you much. It is particularly challenging to focus on the here and now, and It can be difficult, too, holding a conversation when your mind drifts off and is preoccupied with something else beyond this world. Mercury here is impressionable and over-sensitive and this frequently leads to misunderstandings, distortion of the facts, and there may also be shyness or seclusion in communication.
According to Steven Forrest:
Pisces is always about surrendering. It’s always about that part of human consciousness that is in closest touch with the multi-dimensional vastness of both the mind and the cosmos. Because of the contact with the infinite, Pisces can never be bound to the logic of this world. As Einstein, himself a Piscean, proved a century ago, time and space are illusions – just artifacts of our limited senses. Not everyone with Mercury in Pisces spends their evenings discussing theoretical physics – more likely it will be poetry, film, music, transpersonal psychology, or mythology. The communicative processes that arise naturally are not always bound to the space-time logic of our “reasonable” human world. That’s fine. The place where your intelligence travels works splendidly for you, once you learn to follow its n-dimensional threads. This Mercury requires suspension of the ego’s need to be right, its need for linearity and reason, and its need “to know what’s happening.” It requires intelligence tempered by soul, poetry, and a respect for life’s mysteries. It requires that lots of information be stored in a thoroughly random-access part of the mind. It thrives on your ability to laugh ay what you don’t understand – and an appreciation of the way laughter itself can feel like a form of understanding.