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Originally Posted by Underwor  As I understand it, the barrier zone is a chemical deterrent, wall 4 is the physical deterrent that forms as the new growth increments seal the wounded area from the outside. I'll check in the morning when I find the pictures I took at one of Alex's sessions in NH. I know we talked about it that day. |
I think some picture this 4th wall as the closure of successive years of woundwood as Mr. Underwor stated. This is obviously incorrect.