Oh, oh... just when things were going so well.

October 3, 2017 (15 days to set-up): We wake up to examine our handiwork from the night before where we'd stacked layers 4 and 5 on the structure.  We discover a crack in one of the pieces. Rats! Kernel Stone, brave as can be swings into action. He gets out the vibrating saw and a drill to begin excavation on the cracked kernel. Once I start breathing again, I can replace it. 

This is what you call a close shave:

I am reminded of a short but pithy poem my beloved glass teacher Dan Crichton used to cite:
"Glass, glass. Pain in the ass."