What's actually happening
A Full Moon happens when the Moon stands opposite the Sun from Earth's point of view. The lunar face is fully illuminated. A Full Moon in Pisces means the Moon is in Pisces while the Sun is in Virgo — the axis of the imagined and the actual, of the transcendent vision and the earthly particular.
The geometry is one of maximum contrast between what is felt and what can be held.
What the tradition makes of it
Full Moons are culmination points. What was seeded at the New Moon has enough light on it to be seen. Pisces adds a quality of emotional and spiritual culmination to the moment: what has been imagined or aspired toward arrives at the point where it must meet the actual conditions of the world.
The Virgo Sun has been attending to what is real, specific, and in need of care. The Pisces Moon holds the feeling of what it all means in a larger sense. The tension between them tends to illuminate where the spiritual aspiration has been grounded in practical reality — and where it has been maintained at the expense of honest engagement with the particular.
How to actually use it
Allow this phase to bring the imagined and the real into honest contact. This is good weather for creative work that requires both vision and craft, for spiritual practice grounded in the details of daily life, and for the recognition that the transcendent does not replace the ordinary but lives within it.
When in doubt
Ask what the dream is asking of you in practical terms — and whether you are willing to meet it there.