Cathedral

You don’t see this pattern very often. I discovered it at the University of Washington digital library, where it is called Cathedral or Fountain.

Richard Wolfe calls this pattern Fountain or Double Nonpareil or Double Combed in his book about Josef Halfer.

Here is another variant, using the color palette from another University of Washington exhibit:

This is the effect of reversing the direction of the underlying Nonpareil pattern:

The sequence of images below shows my attempt to emulate the Washington exhibit using a similar colour palette. (I rotated the image by 90 degrees anticlockwise.)

The first step is a very short up-down comb applied to a random pattern of dots:

Next comes a left-right comb to create a horizontal Gelgit:

The third step is a narrow downward comb to create the Nonpareil pattern:

The penultimate step is a rightwards stroke with a wide rake. The result is the Icarus pattern:

The Cathedral pattern is completed by applying a wide rake in the downward direction. In this case, I used the same tine gap as in the previous step.

And finally, here is a close-up of the Cathedral pattern (computed at a higher resolution).

I have also seen a pattern that was called Cathedral that just uses a vertical Gelgit as base pattern instead of Nonpareil. Halfer calls this pattern American.

Here are some examples of the effect that can be achieved. The first one starts from the same base pattern and colour palette as the previous example.