See Physics, Touch Physics
Reading equations in a textbook is one thing — watching them come alive is another. Why does wave interference create a striped pattern? How do three simple rules produce a school of fish? What does chaos actually look like? Every simulator here runs entirely in your browser. Pick one that looks interesting and start exploring.
Waves & Sound
4Ripple Pool
Click to create wave sources and watch circular waves overlap, cancel, and reinforce in real time.
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Sound Wave Audio
Blend sine, square, and sawtooth waves, then play the result through your speakers. Hear Fourier synthesis in action.
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Doppler Effect
Animate a moving sound source and see the wavefronts compress and stretch — the reason an ambulance changes pitch as it passes.
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String Resonance
Drive a fixed-end string at different frequencies and find the harmonics where standing waves lock in perfectly.
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Light & Optics
3Fourier Epicycles
Stacked rotating circles trace any complex curve. A mesmerizing visual proof that every periodic signal is just sines added together.
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Hologram Pattern
Place two coherent light sources and explore the bright fringes and dark nulls of two-source interference.
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Lens Ray Tracer
Drag converging and diverging lenses into a light beam and track the refracted rays to the focus point or virtual image.
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Fluid & Heat
5Turing Patterns
Two chemicals react and diffuse — and leopard spots, zebra stripes, and shell patterns emerge spontaneously. Alan Turing's 1952 reaction-diffusion model.
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Lava Lamp
Thermal buoyancy drives slow, hypnotic blobs rising and falling. A beautiful real-time model of natural convection.
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Convection Cells
Bénard convection rolls form when a fluid layer is heated from below. The same physics drives ocean currents and mantle flow.
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Vortex Formation
Watch vortices shed alternately from a bluff body to form a Kármán vortex street — the same instability that can destroy bridges.
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Liquid Pour
SPH particle-based liquid simulation. Tilt the container and watch the fluid splash, swirl, and settle under gravity.
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Mechanics & Collisions
4Elastic Billiards
Perfectly elastic collisions between discs. Watch momentum and kinetic energy redistribute with every bounce — conservation laws made visible.
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Newton's Cradle
Five steel balls pass momentum down the line. Change how many you lift and discover why the physics is more subtle than it looks.
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Domino Chain
Topple the first domino and watch the chain reaction propagate. Adjust spacing and height to control the wave speed.
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N-Body Gravity
Multiple masses pulling on each other in real time. Stable orbits, chaotic escapes, and binary systems emerge from Newton's law alone.
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Space & Celestial
2Gravity Well
Fling particles into a gravity well and find elliptical orbits, parabolic escape trajectories, and the critical escape velocity.
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Slingshot Maneuver
Pilot a spacecraft through a planetary flyby and gain free velocity from the planet's orbital momentum — the same trick Voyager used.
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Swarms & Life
3Boids Flocking
Three rules — separation, alignment, cohesion — and a whole flock of birds or fish emerges. Craig Reynolds' 1986 emergent behavior model.
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Bifurcation Diagram
Sweep the logistic map's growth rate and watch a single stable point period-double its way into full chaos. The road to chaos, live.
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Phase Space Portrait
Plot the pendulum or Lorenz attractor in phase space. The shape of the attractor tells the whole story of a dynamical system's long-term fate.
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EM & Quantum
2Charged Particle Trap
Use combined electric and magnetic fields to trap a charged particle in midair — the working principle behind the ion traps used in quantum computers.
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Magnetic Field Lines
Arrange magnets and watch field lines update in real time. Compare dipole, quadrupole, and Helmholtz configurations.
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Patterns & Algorithms
2Crystal Deformation
Apply stress to an atomic lattice and watch dislocations nucleate and slip planes glide — the atomistic origin of plastic deformation.
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Maze Solver
Generate a random maze and watch BFS, DFS, and A* find the exit — step by step. See how different search strategies explore the space.
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