Decay was a built-in function of the City’s towers, crafted from translucent casein and mycelium masonry. Those walls would, in time, begin to decompose, at which point they’d either be repaired by materials grown for that express purpose, or, if the building was no longer in use, be reabsorbed into the landscape that had hosted it for a time. But a Factory Age building, a metal building—that was of no benefit to anything beyond the small creatures that enjoyed some temporary shelter in its remains. It would corrode until it collapsed. That was the most it would achieve. Its only legacy was to
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