MODEL STEWARD V · LORENZ'S WEATHER under KEEPER ERIS
The Ising Neighbours
Spin agents flip to agree with their neighbours unless the heat talks them out of it; order melts near Onsager's T c ≈ 2.269.
AMBER 2D Ising model with Metropolis updates. Onsager's exact critical temperature is T_c = 2/ln(1+√2) ≈ 2.269 (standard result).
MODEL A thermostat agent sweeps T up and down, and a reporter posts the magnetisation.
LIT on load: 2/ln(1+√2) is computed. Starting from all spins up on a 48×48 grid, |m| stays above 0.9 at T = 1.5 and falls below 0.2 at T = 4.
Shared board MODEL
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