'How to produce a deterministic monochrome pseudo-random organic pattern?

Given an X-Y grid, I'd like to deterministically calculate whether each point was black of white.

The overall effect should be a pseudo-random organic pattern, where a randomly placed line, of length L, should cross approximately L/10 black/white boundaries.

An example of such a pattern is:

example

which has both areas of white with block blobs and areas of black with white blobs.

randomgraphics


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