Sharon, the patternation was deliberate, it was using a flaw in the very simple painting app I use, if you change a colour the change leaves a pixelated edge behind of the previous colour, I think it works as a kind of aura around some of the figures but as you observe is not always successful, I like exploring 'mistakes' and quirks in the app. I used the 'invert colours' command and that created the present colour scheme and brought in the dramatic black.
thanks for commenting, I wonder why so many view these but so few comment, unusual on Eratosphere for people to be shy about having their say.
kind regards
Ross
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