Your count, drawn as a tunnel into the centre. { [ >> ( my:0 ( gap:0 potential:0 ) >> your:0 ) << ] } — and it's the original spine e ( p ( g·g ) p ) e with its seam pried open. The brackets are the e shell, the entry >> and exit << are the two faces of the p shell, my:0 / your:0 are the crossing, and the doubly-held centre (gap:0 potential:0) is g·g — two zeros, never one. Open it and the centre nests into another seam. It reads the same both ways, because a held centre is its own mirror.