Figure E3 AMPHIBIAN

Take us now far from this tipping point

Into a future, cavernous, dim, with stink

Ammoniack and rank: without joint,

All smooth our round enclosure, nacre-pink,

This is the cockpit: see, the pilots think

And their great living vessel does obey.

The bladder closes round us and we sink

Or rise as it expands: in this far day

Such living submarines will ply their finny way.