You are looking through a slice of every possible beginning of the three-body problem. Each point is a complete starting configuration (three masses, their positions and velocities), followed forward until its fate is known. The colour records that fate.

The slice is a flat plane through an eight-dimensional space of starting conditions. It can be moved, rotated and tilted to look along any direction. Where two fates meet, the boundary is not a line: zoom in and it opens into finer structure without end.

Principia is the instrument that makes these pictures, and measures what they show. Where it can't trust a result, it says so, rather than colouring a guess.

Atlas	Browse the space of beginnings on the GPU, natively, or in the browser as the same app. Pan, zoom without end, and rotate or tilt the slice in any direction.
Charts	Flat slices, the shape sphere, Burrau's problem, or a chart built from any axes you choose.
Fate	Every point integrated forward, regularised through close encounters, until a body escapes, two collide, or time runs out.
Refinement	Samples go where fates change, and stay coarse where they don't.
Stain	A graph from what was measured to how it looks, printed in watercolour, pencil or ink. The data doesn't change, only the ink.
Inspector	Follow one beginning closely, at double precision, and watch its orbit.
Honesty	It shows where its precision runs out: open any point to watch its single- and double-precision orbits part, and when. Failed runs are kept and counted, never painted over.
Prints	Every image carries its own settings, so any view can be recreated from the picture alone.
Results	Browsing buys hypotheses; the batch job, run at full precision, buys results.

Under construction. The foundations are laid, and the interface already runs against a stand-in engine.