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Andreas Rejbrand’s Website

“Fluorescence”, a cellular automaton

Both “Fuzz with dust” and “Dunes” contain the following rule as “subrules”: replace a cell’s value by the successor (mod N) of the average of the values of the von Neumann neighbours. How does this rule look on its own?

The answer is that it produces growing fluorescent cells on a folder-containing background:

The “Fluorescence” cellular automaton.

The fluorescence becomes apparent when the background darkens, as it does cyclically:

The “Fluorescence” cellular automaton.

A less zoomed-in picture (with a different colour scheme):

The “Fluorescence” cellular automaton.

With the “Rainbow” colour scheme, the illusion of fluorescence disappears, but the images are still very pleasant:

The “Fluorescence” cellular automaton.


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