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An important contribution from a member of 'thunderbolts forum' comes from the efforts of
plasmatic.... with an ionic air purifier experiment.
Those experiments have shown the patterns, in dust, formed by electric discharge and these are in deeper material than the CRT features.
Image credit: James St.Pe of Thunderbolts forum (Plasmatic MnemoHistory)
A tight column of spiralling material occurs during electric discharge experiment
To more discharge images of spiders
The next image shows the result of a dark-discharge (no arc) from a laterally-stationary probe(my finger) lowered toward a plastic lid, containing sifted and strained dirt, on the monitor (powered on for this phase). I could feel strong air movement as the material was removed, note that the centers were not disturbed in either feature. The small one was made second as charge equalibrium was occurring.
The additional features were made with the power off.
These next images are from the pass-over monitor experiment
The crater-like features and the negative-spiders are two ends of the same discharge.
There are interior features in these crater-like circles which may give us a clue to dendritic ridge formation.
Martian Spiders on a CRT
See 07 Poster Presentation