It looked like a map of my own thinking at fourteen. Loops. Tangents. Sudden, violent escapes. And at the center of it all, the starting point: a small, gray circle, still vibrating slightly, waiting to be told what to do.
Still falling. Still perfect.
And every so often—if you press spacebar hard enough—something clicks . Not the click of success. The click of a hinge finding its true axis. A gear finding its tooth. A box coming to rest exactly where it was meant to, even if you never planned it.
I turned it on for the marble. Over twenty minutes, the screen filled with a tangled, scribbled spiral—the path of every failed attempt, every near-miss, every wild trajectory into nothing. algodoo old version
But the .phz remains. And somewhere in its binary heart, a circle with mass 1.0, restitution 0.8, and no name, is still waiting for spacebar.
But nothing collides perfectly. That's the lesson the old engine teaches you without words.
A wooden box fell. A pendulum swung. A laser fired a millisecond too late. And I watched the marble roll down the ramp, hit the first domino, and—as always—fly off into the void at the edge of the screen. It looked like a map of my own thinking at fourteen
I laughed. Then I didn't.
I loaded a save file from 2012 last night. The filename was untitled_23.phz . The thumbnail was a Rube Goldberg machine I built when I was fourteen—a marble that never actually made it to the goal.
When the scene rendered, nothing moved. Hundreds of hinges, lasers, axles, and thrusters sat frozen in a perfect, silent diagram of teenage ambition. Then I pressed the spacebar. Sudden, violent escapes
You start with a circle. In the new version, it snaps to a grid, eager to please. In the old version, you click, you drag, and it wobbles into existence—imperfect, slightly off-axis, held together by a physics engine that has just enough bugs to feel alive .
There is a specific shade of blue in the old version—the sky behind the blank scene. Not the crisp, gradient-rich blue of today, but a flat, almost clinical cyan. It feels less like a sky and more like the inside of a cathode ray tube dreaming of emptiness.
You can set restitution to 1.0—perfect bounciness. You can set friction to 0.0—infinite glide. You can lock axes, weld hinges, script thrusters with custom post-step math.