The hexagram means communication, as epitomised by
the illumination of light.
It may mean shining a light, seeing a light or seeing what a light reveals.
It implies that the light is bright, that the medium
through which it shines is transparent and that the light is quickly and clearly perceived. The hexagram means successful communication.
It may be that one's feelings and thoughts can be externalised
to be perceptible to others
or that another’s expression can be
clearly perceived, and that there are no intervening obstacles to their conveyance.
It may also be that one's general environment can be clearly seen.
Brightness of expression and clarity of perception
are assisted by clarity of mind.
Just as they make for fast communication,
brightness and clarity can pass quickly. Be quick to get the picture.
The hexagram may simply be referring to the presence of light or clarity, perhaps to a bright sunny day
or the light of a fire, or to a general openness to communication.
The hexagram relates specifically to communications
between things that are not unified by their act of communicating, so that qualities
such as speed, brightness and clarity play a role in the communication.