How to play

The viewport shows a 3D lattice of grid lines filling a cube of space. Every vertex of the lattice is pulled radially toward each mass — space itself contracting — so lines bunch up and brighten near heavy objects. This is deliberately not the sagging-rubber-sheet picture: the displacement happens in all three dimensions.

Drag to orbit the camera, scroll to zoom. Presets range from a lone star to a binary black-hole merger whose orbit decays until the two collapse into one, ringing the grid with a burst of gravitational waves.

Click empty space to drop a test particle. In Orbit mode it gets circular orbital velocity; in Free-fall mode it starts at rest and falls along the curved grid — matter telling space how to curve, curved space telling matter how to move.

The warp slider exaggerates or relaxes the visual displacement without touching the physics. Grid density and lattice/sheet modes trade detail for clarity; the sheet mode shows in-plane compression, not sag.

Space pauses, R resets the preset, C clears particles.

Scoring

• There is no score — The Fabric of Space is a pure visual playground, like Solar Sandbox and A Rock.

Tips

• Watch the Star & Planet preset with trails on: the planet drags its own small dimple through the grid as it orbits.
• Load the Black Hole Merger, turn the time slider up slightly, and wait — the chirp at the end is the whole show.
• Drop a free-fall particle far from a star, then the same distance from a black hole, and compare how the grid steepness predicts the plunge.

Frequently asked questions

Is this what gravity really looks like?

It's an honest cartoon. The radial pull of the grid toward mass mirrors how spatial distances genuinely contract near a massive body in general relativity, and the test particles follow real Newtonian free-fall. The exaggeration slider exists because real curvature at these scales would be invisibly subtle.

Why not the classic rubber sheet?

The sheet-with-a-bowling-ball picture uses gravity to explain gravity, and hides that the distortion is three-dimensional. Here the grid is displaced in every direction around the mass, which is much closer to the truth.

Are the gravitational waves real physics?

Stylized but honestly shaped: binary systems emit an outgoing quadrupole ripple at twice the orbital frequency, the merger chirps as the orbit tightens, and the ringdown decays exponentially — the same anatomy LIGO hears, drawn slow enough to watch.

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