The planet is flat and square, possessing four edges, a membranous plane and one central fungus.
The fungus looms visibly from anywhere on the planet—including the edges themselves. This masks the fungus’ immensity, as the lack of other features makes the visible estimation of distance impossible.
When one first makes planetfall near one of the four edges, the fungus seems small and closeby; as one begins to travel inward, however, one begins to realize the true dimension.
There happens an illusion:
It is not the planet and the fungus which “grow” with each of the beholder’s inward steps, but the beholder herself who feels as if she is shrinking…
Those longevinous enough to arrive finally at the central fungus will thus feel themselves to be the size of subatomic particles, utterly insignificant compared to the fungus, which is the size of many galaxies.
They will also remember nothing of their past lives, and become mushrooms.
All who perish prior to reaching the central fungus shall, once sufficiently decayed, be absorbed through the plane, by the fungal mycellium, reassembled and expelled as spores to journey and reproduce across the universe.
—Drax Antonius, Guide to the Features of the Wæström Cluster, “Mycorœm”