Flow Field

Thousands of particles advected through fractal noise.

images.flowfield · v1 · renderer canvas

1,500 particles · 190-step trails · step 1.6px · zoom 2.2 · 4 octaves · alpha 0.200

[data-canvas-stage] { display: none; }

Drawn in the browser

This generator does not send you an image. The server sends a short description of one — the parameters below, plus a 32-byte key — and the drawing is done here, from the same byte stream the server would have used. That needs JavaScript, so with it switched off there is nothing to show.

The description itself is still public: /api/v1/g/images.flowfield returns it, and the maths is in resources/js.

1,500 particles · 190-step trails · step 1.6px · zoom 2.2 · 4 octaves · alpha 0.200

Controls · from schema()

Width

256 2048

Height

256 2048

Particles

100 2500

Each one traces a single trail and is never reused.

Trail length

10 420

Steps before a particle runs out. Long trails cross the whole canvas; short ones read as brushwork.

Step length

0.4 6

Pixels advanced per step. Small steps hug the field, large ones cut across it.

Field zoom

0.4 9

How many noise cells fit across the canvas.

Detail (octaves)

1 7

Angular range

0.2 3

How many full turns the noise maps onto. Below 1 the flow stays combed in one direction; above 2 it knots.

Line alpha

0.01 0.8

Per-segment opacity. The picture is the overlap, so this wants to stay low.

Line width

0.4 4

Additive blending

Trails add their light together instead of painting over each other. On a dark ground this is the whole look.

Ground

Colour

Palette size

2 12

Grain

0 0.08

Per-pixel noise over the finished render. A little of it is the difference between generative and computer-made.

Entropy source

Picking a source changes the story on the receipt, never the quality: anything below class A is mixed with the OS CSPRNG before it reaches you. This result actually came from NOAA Space Weather.

seed token N10MZQW1QVKFGM3W7BBF3DYV3R

Re-render keeps this token. Generate replaces it. That is the whole idea.

Burned into the corner before the file is written, so the image keeps its provenance wherever it ends up:

entropy in

16 bytes

stream used

46 bytes

rejections

duration

207 µs

palette

background

#010103

segments

285,000

field evaluations

1,140,000

Seed receipt

Class C · Observational

Planetary K-index 2.00 — the field was unsettled when this was made.

Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.

source: NOAA Space Weather
observed: 2026-10-28T22:09:00+00:00
latency: 296ms
mixed with: csprng — always

https://www.swpc.noaa.gov/products/planetary-k-index ↗

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The token is the seed, so this link recomputes the result rather than looking it up. No database, and it works for as long as v1 does.

This page and /api/v1/g/images.flowfield run the same code. There is no private endpoint.

Flow Field

Result

Measurements

Seed receipt

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