In German it is kind of colloquial phrase for a kind of derogative or sarcastic description of things, which are the source of something are. You use it, if you want to explain something to somebody, who you think is to dull-witted to get the point, so you get back to the beginning of the theme, so he can hopefully understand it if you start from the basics.
your work is featured in Special Feature: Drawings IV ║▌│█│║▌║││█║▌│║║▌│█│║▌║││ Drawing is the artist's most direct and spontaneous expression, a species of writing: it reveals, better than does painting, his true personality. (Edgar Degas)
Thanks, its old and originally a design for an etching, thats why the A is in the wrong place, its meant to be reversed. I just added the text (nautisch urschleim) when I realised it would just be a drawing.