About Caught in a Mosh

Caught in a Mosh is a free, interactive mosh pit simulator by Edgar Ortiz LLC. It turns a concert floor into a small physics experiment: each dot has a mass, a velocity, a preferred heading, and forces acting on it.

Change one setting and watch what follows. More alignment can make neighbors move together. A tighter crowd creates more contact. Turning self-propulsion off lets the motion fade as damping takes energy away.

Why a mosh pit?

A crowd can look chaotic while still showing collective patterns. The project was inspired by Dr. NEMO’s video about mosh pits and related work by Silverberg and colleagues. The explanations and force inspector make the model’s assumptions visible, so you can explore how its behavior arises.

What the model can tell you

This is an original educational model built from soft discs, local steering, repulsive contacts, and damping. Circle mode supplies a preferred route and turning direction. The simulation lets you investigate these rules; it does not establish how every real crowd behaves.

The model does not represent falls, fatigue, fear, exits, injuries, or human decisions about participation. It is not a validated crowd-safety prediction tool.

Free to explore

The simulator runs in your browser and needs no account. Advertising space is reserved to help support the project. No third-party ads are currently served.