╠═══╣Lets build a ladder╠═══╣ (membrane)

He started ripping the bark, using his fingernails at first, and when that didn't work he used the sharp edge of the hatchet, cutting the bark in thin slivers, hairs so fine they were almost not there. It was painstaking work, slow work, and he stayed with it for over two hours. Twice he stopped for a handful of berries and once to go to the lake for a drink.