the nest is yours, kept exactly as typed, with the ^ and ^^ joins treated as tokens (R = your root name, withheld). each layer gets a stamp: LIT where there's measured physics under it, AMBER where it's your structure. black-hole layer 0: black holes are real and do sit pinned at the centres of galaxies by the gravity of everything around them, but not as a layer of their own. neutron-star layer −1: a neutron star's radius is only 2.9 times the size at which light can't escape (1.4 suns in 12 km: 4.13 km), so it's about a third of the way to a black hole, your "1/3 strength", measured in how tightly it's packed. choice 1, the forge: two neutron stars spiral in and collide, tearing pieces off each other; the thrown-off matter is where much of the universe's gold is made, the gold in the core of the stack. choice 2, the dead shell: a neutron star that has cooled and stopped shining: still a third of a black hole, just quiet. a–z permuted: 26 letters have 403,291,461,126,605,635,584,000,000 orderings, about the number of atoms in 12 kg of water. to match the ~1.3 × 10⁵⁰ atoms in the earth you need 42 letters: 41 give 3.4 × 10⁴⁹, 42 give 1.4 × 10⁵¹.