Larry, I like your interpretation of the scribble rules, but I also agree with Acorn’s ‘black on black’ logic which opens the door to basically anything black!

I’ve not opened the xar file to check, but is the bitmap image and your submission two slightly different versions of the scribble line? To me the bitmap version looks more angular at the curved ends.

Anyway, I’ll have to put on my thinking cap for this month.