To the world of spirit there is no such thing as time or space. Reading Barbara Brennan's books (Hands of Light, and Light Emerging) one sees why. The world we see around us is only a small fragment or slice of all which exists. This small fragment is that which our physical bodies can detect and transmit or describe to our consciousness, or which we can construct machines to extend the senses of our physical bodies. There is more in existance than what our bodies can detect in this way (though with some training and practice one can extend the range of what our consciousness can perceive).
Since there is no time and space to limit spirit, Reiki can operate without regard to limitations of space (at least). A level II Reiki practitioner can bring healing to a recipient regardless of distance.
In doing remote healings the recipient is to be objectified somehow, and the symbol drawn in the vicinity of the object representing the recipient. By objectified I mean that it is easier for the conscious mind to deal with objects than abstract things. Therefore when doing a remote healing it is easier on the healer to visualize sending the energy to something than otherwise.
There are many ways of visualizing or objectifying the recipient. For instance
the healer might intend that their knee is the same as the intended recipient,
which will create the necessary connection. Or they might draw in the air a
shape to represent the recipient. Or use a teddy bear, pillow, or some other
physical object as a stand in. The only limit is the healers imagination. For
the healers intent is primary in bring forth the Reiki energy.
This was written by David Herron.