John Calhoun's Universe 25 (1968–1973): 8 mice placed in a enclosure with unlimited food, water, and nesting space. No disease, no predators. A literal utopia.

What happened:

🔵 Normal mice reproduced normally at first

🔴 Aggressive mice emerged as density increased — disrupting social hierarchies

🟡 "Beautiful Ones" appeared — mice that completely withdrew from society, spending all day grooming, never fighting, never mating

📉 Once the Beautiful One fraction crossed ~25%, reproduction essentially stopped — even as population dropped and space opened back up

Calhoun's key finding: the collapse was behavioral, not resource-based. Mice raised during the chaos never learned normal social behaviors. Even with plenty of space and food, they couldn't recover.

This simulation models the stress-cascade and state transitions he described. Built in Python with NumPy.

Full 10-minute simulation: https://youtu.be/wXfq6jY00Lk

Learn more or try it for yourself here: https://github.com/Transcenduality/Genetic-Particle-Life

1. Initial conditions (exact)

Central BH: M = 4 M☉ (geometrized G = c = 1; length unit = GM☉/c² ≈ 1.477 km). Schwarzschild.

Body masses (M☉, geometrized):

Body	Type	Mass (M☉)
0, 1	2× Jupiter	2 × 9.543×10⁻⁴ = 1.9086×10⁻³
2, 3	2× Earth	2 × 3.003×10⁻⁶ = 6.006×10⁻⁶
4, 5	2× Mercury	2 × 1.660×10⁻⁷ = 3.320×10⁻⁷

Per-body placement (radius r, azimuth φ, inclination i — units of M):

k	r	φ (rad)	i (rad)
0	120	0.00	0.00
1	160	1.05	0.30
2	90	2.10	−0.25
3	200	3.14	0.50
4	140	4.19	−0.40
5	110	5.24	0.15

Position (tilted circle): pos = [r·cosφ·cosi, r·sinφ, r·cosφ·sini]
Velocity (circular speed v_c = √(M/r), perpendicular in the tilted plane): vel = [−v_c·sinφ·cosi, v_c·cosφ, v_c·sinφ·sini]1. Initial conditions (exact)Central BH: M = 4 M☉ (geometrized G = c = 1; length unit = GM☉/c² ≈ 1.477 km). Schwarzschild.Body masses (M☉, geometrized):Body Type Mass (M☉)
0, 1 2× Jupiter 2 × 9.543×10⁻⁴ = 1.9086×10⁻³
2, 3 2× Earth 2 × 3.003×10⁻⁶ = 6.006×10⁻⁶
4, 5 2× Mercury 2 × 1.660×10⁻⁷ = 3.320×10⁻⁷Per-body placement (radius r, azimuth φ, inclination i — units of M):k r φ (rad) i (rad)
0 120 0.00 0.00
1 160 1.05 0.30
2 90 2.10 −0.25
3 200 3.14 0.50
4 140 4.19 −0.40
5 110 5.24 0.15Position (tilted circle): pos = [r·cosφ·cosi, r·sinφ, r·cosφ·sini]
Velocity (circular speed v_c = √(M/r), perpendicular in the tilted plane): vel = [−v_c·sinφ·cosi, v_c·cosφ, v_c·sinφ·sini]

Integrator type and step size

• Integrator: velocity-Verlet / leapfrog (kick-drift), fixed step. v += a·dt; x += v·dt per step . Not symplectic-exact (it's the sequential-update leapfrog, not the KDK-symmetric form).
• Step size: dt = T_outer / 600 where T_outer = 2π√(r_out³/M), r_out = 200 (outermost body). → T_outer ≈ 8885.8, dt ≈ 14.81 (M units). So ~600 steps per outer orbit.

3. Metrics

It dumps only trajectories: body_k.csv (t, x, y, z) every 4th step,

4. 1-orbit horizon definition

1 orbit = 1 × T_outer, where T_outer is the outermost body's (r=200) Newtonian circular period 2π√(200³/M)

Predator-prey ABM built in Python/NumPy. Each agent moves, eats, reproduces, and dies based on local conditions — no global rules.

The key mechanic is wolf vision radius: wolves can only detect sheep within a limited range. When sheep density drops, wolves start roaming blind and starving — which is what drives the collapse you see here.

Full 9-minute simulation: https://youtu.be/wqR4A4FUABs

Bad apple!! but it is charges in gravi potential

Cinema 4D and Octane Render

Programmed in Processing. I struggled to get well-defined spiral structures in 2D, but the 3D model looks much better. It did require careful initial position and velocity distribution. There is a fixed "black hole" at the center. Stars come in only two masses, the majority being lower mass.

Programmed in Processing. I used an oct-tree for the 3D simulations. The swimming motion of the worms results from directional instability, i.e. a segment is attracted more to the one ahead of it than vice versa.

Have been working on a hobby project of mine for a few months and its now reached the point of being usable. Here are the sims in the gallery

1. Hubble space telescope orbit
2. Swift Observatory orbital decay
3. Type 1 super nova
4. Type II super nova
5. Lorenz 96 sim

Two curated Conway Glyphs engaged in an intricate dance according to the "Adversarial Conway" algorithm.

All music royalty-free from www.epidemicsound.com
Leah Ryder - Caracal

The new genetically evolving version is now on GitHub! (Free and open source): https://github.com/Transcenduality/primordis/tree/main

Posted it before in vertical version. This time horizontal. It's made in our custom voxel sandbox. Physics is prioprietary and runs on GPU

Aircraft diving through heavy rain, strong wind and fog.
Focused on wet surface details and cinematic storm mood.
Final compositing done in Nuke.