Not Slug Grafitti (as pictured below), but the other kind… made by snails (the living creatures).
Credit: LDNGRAFFITI.CO.UK
Or from another time, a long time ago…
Please see: 18000 – 10000 BC
It is called Pattern Recognition (everyone knows how to do it (Darwin) and everyone does it unconsciously; the results (analysis) however differs). A degree of…