@geoffl Indeed, yes, that’s what I meant by my hunch. However: the snowflakes all have fourfold symmetry but I don’t think it *necessarily* follows that the matrices also have to have it. It might be possible to construct a non-symmetric matrix that has a symmetric snowflake in the middle.

@kake With a bigger grid to stitch across you can have a matrix that has larger offsets on one side than the other without breaking the snowflake (as no points of the probability matrix lay on, or need to lay next to, the boundry of the snowflake) but I can't tell if you can fill the rest of the probability matrix without breaking it. Feels like it should work.