In the next half hour after that, I began to feel an instinctual urge to turn back, which I overrode by telling myself I could not yet face the return journey and the Crawler again. But the grooves in the ceiling hurt to look at, as if they ran across the outside of my own skull, continually being remade there. They had become lines of some repelling force. An hour later, as that shimmering white rectangle became larger but no more distinct, I was filled with such a feeling of wrongness that I suffered nausea. The idea of a trap grew in my mind, that this floating light in the darkness was not
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